diff --git a/src/index.ts b/src/index.ts
index 303ed28..1eb5ffd 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -48,6 +48,9 @@ export function badgen ({
   const width = sbRectWidth + stRectWidth
   const xlink = icon ? ' xmlns:xlink="http://www.w3.org/1999/xlink"' : ''
 
+  const gradientId = generateRandomID(5)
+  const maskId = generateRandomID(5)
+
   label = label ? sanitize(label) : ''
   status = sanitize(status)
   color = sanitize(color)
@@ -74,15 +77,15 @@ export function badgen ({
 
   return `<svg width="${scale * width / 10}" height="${scale * 20}" viewBox="0 0 ${width} 200" xmlns="http://www.w3.org/2000/svg"${xlink} role="img" aria-label="${accessibleText}">
   <title>${accessibleText}</title>
-  <linearGradient id="a" x2="0" y2="100%">
+  <linearGradient id="${gradientId}" x2="0" y2="100%">
     <stop offset="0" stop-opacity=".1" stop-color="#EEE"/>
     <stop offset="1" stop-opacity=".1"/>
   </linearGradient>
-  <mask id="m"><rect width="${width}" height="200" rx="30" fill="#FFF"/></mask>
-  <g mask="url(#m)">
+  <mask id="${maskId}"><rect width="${width}" height="200" rx="30" fill="#FFF"/></mask>
+  <g mask="url(#${maskId})">
     <rect width="${sbRectWidth}" height="200" fill="#${labelColor}"/>
     <rect width="${stRectWidth}" height="200" fill="#${color}" x="${sbRectWidth}"/>
-    <rect width="${width}" height="200" fill="url(#a)"/>
+    <rect width="${width}" height="200" fill="url(#${gradientId})"/>
   </g>
   <g aria-hidden="true" fill="#fff" text-anchor="start" font-family="Verdana,DejaVu Sans,sans-serif" font-size="110">
     <text x="${sbTextStart + 10}" y="148" textLength="${sbTextWidth}" fill="#000" opacity="0.25">${label}</text>
@@ -101,6 +104,9 @@ function bare ({ status, color = 'blue', style, scale = 1 }: BadgenOptions) {
   const stTextWidth = calcWidth(status)
   const stRectWidth = stTextWidth + 115
 
+  const gradientId = generateRandomID(5)
+  const maskId = generateRandomID(5)
+
   status = sanitize(status)
   color = sanitize(color)
 
@@ -119,14 +125,14 @@ function bare ({ status, color = 'blue', style, scale = 1 }: BadgenOptions) {
 
   return `<svg width="${scale * stRectWidth / 10}" height="${scale * 20}" viewBox="0 0 ${stRectWidth} 200" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="${status}">
   <title>${status}</title>
-  <linearGradient id="a" x2="0" y2="100%">
+  <linearGradient id="${gradientId}" x2="0" y2="100%">
     <stop offset="0" stop-opacity=".1" stop-color="#EEE"/>
     <stop offset="1" stop-opacity=".1"/>
   </linearGradient>
-  <mask id="m"><rect width="${stRectWidth}" height="200" rx="30" fill="#FFF"/></mask>
-  <g mask="url(#m)">
+  <mask id="${maskId}"><rect width="${stRectWidth}" height="200" rx="30" fill="#FFF"/></mask>
+  <g mask="url(#${maskId})">
     <rect width="${stRectWidth}" height="200" fill="#${color}" x="0"/>
-    <rect width="${stRectWidth}" height="200" fill="url(#a)"/>
+    <rect width="${stRectWidth}" height="200" fill="url(#${gradientId})"/>
   </g>
   <g aria-hidden="true" fill="#fff" text-anchor="start" font-family="Verdana,DejaVu Sans,sans-serif" font-size="110">
     <text x="65" y="148" textLength="${stTextWidth}" fill="#000" opacity="0.25">${status}</text>
@@ -149,6 +155,17 @@ interface AccessibleTextProps {
   label?: string;
 }
 
+function generateRandomID(length: number): string {
+  const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
+  let result = '';
+
+  for (let i = 0; i < length; i++) {
+    result += characters.charAt(Math.floor(Math.random() * characters.length));
+  }
+
+  return result;
+}
+
 function createAccessibleText({label, status}: AccessibleTextProps): string {
   const labelPrefix = label ? `${label}: ` : '';
   return labelPrefix + status;
diff --git a/tap-snapshots/test/badgen.spec.js.test.cjs b/tap-snapshots/test/badgen.spec.js.test.cjs
index 3550be2..ff7dc1d 100644
--- a/tap-snapshots/test/badgen.spec.js.test.cjs
+++ b/tap-snapshots/test/badgen.spec.js.test.cjs
@@ -8,15 +8,15 @@
 exports[`test/badgen.spec.js TAP ensure badgen() correctly escapes string inputs > snapshot 1`] = `
 <svg width="191.2" height="20" viewBox="0 0 1912 200" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" role="img" aria-label="&lt;escape me&gt;: &lt;escape me&gt;">
   <title>&lt;escape me&gt;: &lt;escape me&gt;</title>
-  <linearGradient id="a" x2="0" y2="100%">
+  <linearGradient id="aaaaa" x2="0" y2="100%">
     <stop offset="0" stop-opacity=".1" stop-color="#EEE"/>
     <stop offset="1" stop-opacity=".1"/>
   </linearGradient>
-  <mask id="m"><rect width="1912" height="200" rx="30" fill="#FFF"/></mask>
-  <g mask="url(#m)">
+  <mask id="aaaaa"><rect width="1912" height="200" rx="30" fill="#FFF"/></mask>
+  <g mask="url(#aaaaa)">
     <rect width="1036" height="200" fill="#&lt;escape me&gt;"/>
     <rect width="876" height="200" fill="#&lt;escape me&gt;" x="1036"/>
-    <rect width="1912" height="200" fill="url(#a)"/>
+    <rect width="1912" height="200" fill="url(#aaaaa)"/>
   </g>
   <g aria-hidden="true" fill="#fff" text-anchor="start" font-family="Verdana,DejaVu Sans,sans-serif" font-size="110">
     <text x="220" y="148" textLength="776" fill="#000" opacity="0.25">&lt;escape me&gt;</text>
@@ -31,14 +31,14 @@ exports[`test/badgen.spec.js TAP ensure badgen() correctly escapes string inputs
 exports[`test/badgen.spec.js TAP ensure bare() correctly escapes string inputs > snapshot 1`] = `
 <svg width="89.1" height="20" viewBox="0 0 891 200" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="&lt;escape me&gt;">
   <title>&lt;escape me&gt;</title>
-  <linearGradient id="a" x2="0" y2="100%">
+  <linearGradient id="aaaaa" x2="0" y2="100%">
     <stop offset="0" stop-opacity=".1" stop-color="#EEE"/>
     <stop offset="1" stop-opacity=".1"/>
   </linearGradient>
-  <mask id="m"><rect width="891" height="200" rx="30" fill="#FFF"/></mask>
-  <g mask="url(#m)">
+  <mask id="aaaaa"><rect width="891" height="200" rx="30" fill="#FFF"/></mask>
+  <g mask="url(#aaaaa)">
     <rect width="891" height="200" fill="#&lt;escape me&gt;" x="0"/>
-    <rect width="891" height="200" fill="url(#a)"/>
+    <rect width="891" height="200" fill="url(#aaaaa)"/>
   </g>
   <g aria-hidden="true" fill="#fff" text-anchor="start" font-family="Verdana,DejaVu Sans,sans-serif" font-size="110">
     <text x="65" y="148" textLength="776" fill="#000" opacity="0.25">&lt;escape me&gt;</text>
@@ -50,15 +50,15 @@ exports[`test/badgen.spec.js TAP ensure bare() correctly escapes string inputs >
 exports[`test/badgen.spec.js TAP generate badge with { label, status } > snapshot 1`] = `
 <svg width="80.4" height="20" viewBox="0 0 804 200" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="npm: v1.0.0">
   <title>npm: v1.0.0</title>
-  <linearGradient id="a" x2="0" y2="100%">
+  <linearGradient id="aaaaa" x2="0" y2="100%">
     <stop offset="0" stop-opacity=".1" stop-color="#EEE"/>
     <stop offset="1" stop-opacity=".1"/>
   </linearGradient>
-  <mask id="m"><rect width="804" height="200" rx="30" fill="#FFF"/></mask>
-  <g mask="url(#m)">
+  <mask id="aaaaa"><rect width="804" height="200" rx="30" fill="#FFF"/></mask>
+  <g mask="url(#aaaaa)">
     <rect width="349" height="200" fill="#555"/>
     <rect width="455" height="200" fill="#08C" x="349"/>
-    <rect width="804" height="200" fill="url(#a)"/>
+    <rect width="804" height="200" fill="url(#aaaaa)"/>
   </g>
   <g aria-hidden="true" fill="#fff" text-anchor="start" font-family="Verdana,DejaVu Sans,sans-serif" font-size="110">
     <text x="60" y="148" textLength="249" fill="#000" opacity="0.25">npm</text>
@@ -73,15 +73,15 @@ exports[`test/badgen.spec.js TAP generate badge with { label, status } > snapsho
 exports[`test/badgen.spec.js TAP generate badge with { label, status, color } > snapshot 1`] = `
 <svg width="80.4" height="20" viewBox="0 0 804 200" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="npm: v1.0.0">
   <title>npm: v1.0.0</title>
-  <linearGradient id="a" x2="0" y2="100%">
+  <linearGradient id="aaaaa" x2="0" y2="100%">
     <stop offset="0" stop-opacity=".1" stop-color="#EEE"/>
     <stop offset="1" stop-opacity=".1"/>
   </linearGradient>
-  <mask id="m"><rect width="804" height="200" rx="30" fill="#FFF"/></mask>
-  <g mask="url(#m)">
+  <mask id="aaaaa"><rect width="804" height="200" rx="30" fill="#FFF"/></mask>
+  <g mask="url(#aaaaa)">
     <rect width="349" height="200" fill="#555"/>
     <rect width="455" height="200" fill="#ADF" x="349"/>
-    <rect width="804" height="200" fill="url(#a)"/>
+    <rect width="804" height="200" fill="url(#aaaaa)"/>
   </g>
   <g aria-hidden="true" fill="#fff" text-anchor="start" font-family="Verdana,DejaVu Sans,sans-serif" font-size="110">
     <text x="60" y="148" textLength="249" fill="#000" opacity="0.25">npm</text>
@@ -113,15 +113,15 @@ exports[`test/badgen.spec.js TAP generate badge with { label, status, color, sty
 exports[`test/badgen.spec.js TAP generate badge with { label, status, icon } > snapshot 1`] = `
 <svg width="95.5" height="20" viewBox="0 0 955 200" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" role="img" aria-label="docker: icon">
   <title>docker: icon</title>
-  <linearGradient id="a" x2="0" y2="100%">
+  <linearGradient id="aaaaa" x2="0" y2="100%">
     <stop offset="0" stop-opacity=".1" stop-color="#EEE"/>
     <stop offset="1" stop-opacity=".1"/>
   </linearGradient>
-  <mask id="m"><rect width="955" height="200" rx="30" fill="#FFF"/></mask>
-  <g mask="url(#m)">
+  <mask id="aaaaa"><rect width="955" height="200" rx="30" fill="#FFF"/></mask>
+  <g mask="url(#aaaaa)">
     <rect width="631" height="200" fill="#555"/>
     <rect width="324" height="200" fill="#08C" x="631"/>
-    <rect width="955" height="200" fill="url(#a)"/>
+    <rect width="955" height="200" fill="url(#aaaaa)"/>
   </g>
   <g aria-hidden="true" fill="#fff" text-anchor="start" font-family="Verdana,DejaVu Sans,sans-serif" font-size="110">
     <text x="220" y="148" textLength="371" fill="#000" opacity="0.25">docker</text>
@@ -170,15 +170,15 @@ exports[`test/badgen.spec.js TAP generate badge with { label, status, style } >
 exports[`test/badgen.spec.js TAP generate badge with { status, icon } > snapshot 1`] = `
 <svg width="53.6" height="20" viewBox="0 0 536 200" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" role="img" aria-label="icon">
   <title>icon</title>
-  <linearGradient id="a" x2="0" y2="100%">
+  <linearGradient id="aaaaa" x2="0" y2="100%">
     <stop offset="0" stop-opacity=".1" stop-color="#EEE"/>
     <stop offset="1" stop-opacity=".1"/>
   </linearGradient>
-  <mask id="m"><rect width="536" height="200" rx="30" fill="#FFF"/></mask>
-  <g mask="url(#m)">
+  <mask id="aaaaa"><rect width="536" height="200" rx="30" fill="#FFF"/></mask>
+  <g mask="url(#aaaaa)">
     <rect width="212" height="200" fill="#555"/>
     <rect width="324" height="200" fill="#08C" x="212"/>
-    <rect width="536" height="200" fill="url(#a)"/>
+    <rect width="536" height="200" fill="url(#aaaaa)"/>
   </g>
   <g aria-hidden="true" fill="#fff" text-anchor="start" font-family="Verdana,DejaVu Sans,sans-serif" font-size="110">
     <text x="172" y="148" textLength="0" fill="#000" opacity="0.25"></text>
@@ -193,15 +193,15 @@ exports[`test/badgen.spec.js TAP generate badge with { status, icon } > snapshot
 exports[`test/badgen.spec.js TAP generate badge with { status, icon, iconWidth } > snapshot 1`] = `
 <svg width="59.6" height="20" viewBox="0 0 596 200" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" role="img" aria-label="icon">
   <title>icon</title>
-  <linearGradient id="a" x2="0" y2="100%">
+  <linearGradient id="aaaaa" x2="0" y2="100%">
     <stop offset="0" stop-opacity=".1" stop-color="#EEE"/>
     <stop offset="1" stop-opacity=".1"/>
   </linearGradient>
-  <mask id="m"><rect width="596" height="200" rx="30" fill="#FFF"/></mask>
-  <g mask="url(#m)">
+  <mask id="aaaaa"><rect width="596" height="200" rx="30" fill="#FFF"/></mask>
+  <g mask="url(#aaaaa)">
     <rect width="272" height="200" fill="#555"/>
     <rect width="324" height="200" fill="#08C" x="272"/>
-    <rect width="596" height="200" fill="url(#a)"/>
+    <rect width="596" height="200" fill="url(#aaaaa)"/>
   </g>
   <g aria-hidden="true" fill="#fff" text-anchor="start" font-family="Verdana,DejaVu Sans,sans-serif" font-size="110">
     <text x="232" y="148" textLength="0" fill="#000" opacity="0.25"></text>
@@ -216,14 +216,14 @@ exports[`test/badgen.spec.js TAP generate badge with { status, icon, iconWidth }
 exports[`test/badgen.spec.js TAP generate bare badge with { status } > snapshot 1`] = `
 <svg width="47" height="20" viewBox="0 0 470 200" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="v1.0.0">
   <title>v1.0.0</title>
-  <linearGradient id="a" x2="0" y2="100%">
+  <linearGradient id="aaaaa" x2="0" y2="100%">
     <stop offset="0" stop-opacity=".1" stop-color="#EEE"/>
     <stop offset="1" stop-opacity=".1"/>
   </linearGradient>
-  <mask id="m"><rect width="470" height="200" rx="30" fill="#FFF"/></mask>
-  <g mask="url(#m)">
+  <mask id="aaaaa"><rect width="470" height="200" rx="30" fill="#FFF"/></mask>
+  <g mask="url(#aaaaa)">
     <rect width="470" height="200" fill="#08C" x="0"/>
-    <rect width="470" height="200" fill="url(#a)"/>
+    <rect width="470" height="200" fill="url(#aaaaa)"/>
   </g>
   <g aria-hidden="true" fill="#fff" text-anchor="start" font-family="Verdana,DejaVu Sans,sans-serif" font-size="110">
     <text x="65" y="148" textLength="355" fill="#000" opacity="0.25">v1.0.0</text>
@@ -235,14 +235,14 @@ exports[`test/badgen.spec.js TAP generate bare badge with { status } > snapshot
 exports[`test/badgen.spec.js TAP generate bare badge with { status, color } > snapshot 1`] = `
 <svg width="47" height="20" viewBox="0 0 470 200" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="v1.0.0">
   <title>v1.0.0</title>
-  <linearGradient id="a" x2="0" y2="100%">
+  <linearGradient id="aaaaa" x2="0" y2="100%">
     <stop offset="0" stop-opacity=".1" stop-color="#EEE"/>
     <stop offset="1" stop-opacity=".1"/>
   </linearGradient>
-  <mask id="m"><rect width="470" height="200" rx="30" fill="#FFF"/></mask>
-  <g mask="url(#m)">
+  <mask id="aaaaa"><rect width="470" height="200" rx="30" fill="#FFF"/></mask>
+  <g mask="url(#aaaaa)">
     <rect width="470" height="200" fill="#ADF" x="0"/>
-    <rect width="470" height="200" fill="url(#a)"/>
+    <rect width="470" height="200" fill="url(#aaaaa)"/>
   </g>
   <g aria-hidden="true" fill="#fff" text-anchor="start" font-family="Verdana,DejaVu Sans,sans-serif" font-size="110">
     <text x="65" y="148" textLength="355" fill="#000" opacity="0.25">v1.0.0</text>
diff --git a/test/badgen.spec.js b/test/badgen.spec.js
index 58f2e43..d39196e 100644
--- a/test/badgen.spec.js
+++ b/test/badgen.spec.js
@@ -2,6 +2,13 @@ const tap = require('tap')
 const { badgen } = require('../dist')
 const icons = require('./assets/icon-data-uri.js')
 
+const originalMath = global.Math
+const mockMath = Object.create(global.Math)
+mockMath.random = () => 0.5
+
+tap.beforeEach(async t => { global.Math = mockMath })
+tap.afterEach(async t => { global.Math = originalMath })
+
 tap.test('generate badge with { label, status }', t => {
   const svg = badgen({ label: 'npm', status: 'v1.0.0' })
   t.ok(typeof svg === 'string', 'successfully generated')