diff --git a/packages/schemas/src/schemas.test.ts b/packages/schemas/src/schemas.test.ts
index 7b215987..019ff3de 100644
--- a/packages/schemas/src/schemas.test.ts
+++ b/packages/schemas/src/schemas.test.ts
@@ -33,6 +33,13 @@ test('rateLimitSchema invalid', () => {
     })
   ).toThrowErrorMatchingSnapshot()
 
+  expect(() =>
+    rateLimitSchema.parse({
+      interval: 0,
+      maxPerInterval: 5
+    })
+  ).toThrowErrorMatchingSnapshot()
+
   expect(() =>
     rateLimitSchema.parse({
       interval: '--',
diff --git a/packages/schemas/src/schemas.ts b/packages/schemas/src/schemas.ts
index cffff7a6..dd9ffe2f 100644
--- a/packages/schemas/src/schemas.ts
+++ b/packages/schemas/src/schemas.ts
@@ -17,12 +17,13 @@ export const rateLimitSchema = z
     /**
      * The interval at which the rate limit is applied.
      *
-     * Either a number in seconds or a valid [ms](https://github.com/vercel/ms)
-     * string (eg, "10s", "1m", "1h", "1d", "1w", "1y", etc).
+     * Either a positive number expressed in seconds or a valid positive
+     * [ms](https://github.com/vercel/ms) string (eg, "10s", "1m", "8h", "2d",
+     * "1w", "1y", etc).
      */
     interval: z
       .union([
-        z.number().nonnegative(), // seconds
+        z.number().positive(), // seconds
 
         z
           .string()
@@ -31,8 +32,14 @@ export const rateLimitSchema = z
             try {
               // TODO: `ms` module has broken types
               const ms = parseIntervalAsMs(value as any) as unknown as number
+              const seconds = Math.floor(ms / 1000)
 
-              if (typeof ms !== 'number' || ms < 0) {
+              if (
+                typeof ms !== 'number' ||
+                Number.isNaN(ms) ||
+                ms <= 0 ||
+                seconds <= 0
+              ) {
                 ctx.addIssue({
                   code: z.ZodIssueCode.custom,
                   message: `Invalid interval "${value}"`,
@@ -42,7 +49,6 @@ export const rateLimitSchema = z
                 return z.NEVER
               }
 
-              const seconds = Math.floor(ms / 1000)
               return seconds
             } catch {
               ctx.addIssue({
@@ -56,7 +62,7 @@ export const rateLimitSchema = z
           })
       ])
       .describe(
-        `The interval at which the rate limit is applied. Either a number in seconds or a valid [ms](https://github.com/vercel/ms) string (eg, "10s", "1m", "1h", "1d", "1w", "1y", etc).`
+        `The interval at which the rate limit is applied. Either a positive number in seconds or a valid positive [ms](https://github.com/vercel/ms) string (eg, "10s", "1m", "8h", "2d", "1w", "1y", etc).`
       ),
 
     /**