diff --git a/docs/getting-started/installation.md b/docs/getting-started/installation.md
index 31bc901b..2026552f 100644
--- a/docs/getting-started/installation.md
+++ b/docs/getting-started/installation.md
@@ -48,7 +48,7 @@ To import individual Shoelace components, use this syntax.
 import { SlButton, SlDropdown } from '@shoelace-style/shoelace/dist/custom-elements';
 
 customElements.define('sl-button', SlButton);
-customElements.define('sl-dropdown', SlButton);
+customElements.define('sl-dropdown', SlDropdown);
 ```
 
 For convenience, the bundle also exports a `defineCustomElements()` method. When this method is called, it will automatically define all Shoelace components in the bundle.
@@ -59,4 +59,4 @@ import { defineCustomElements } from '@shoelace-style/shoelace/dist/custom-eleme
 defineCustomElements();
 ```
 
-While convenient, importing all components like this will make your bundle larger. For best results, only import the components you're actually going to use.
\ No newline at end of file
+While convenient, importing all components like this will make your bundle larger. For best results, only import the components you're actually going to use.
diff --git a/src/utilities/scroll.ts b/src/utilities/scroll.ts
index 8bf7f00c..3a558d90 100644
--- a/src/utilities/scroll.ts
+++ b/src/utilities/scroll.ts
@@ -1,25 +1,23 @@
 import { getOffset } from './offset';
 
-let locks = [];
+const locks = new Set();
 
 //
 // Prevents body scrolling. Keeps track of which elements requested a lock so multiple levels of locking are possible
 // without premature unlocking.
 //
 export function lockBodyScrolling(lockingEl: HTMLElement) {
-  if (lockingEl && !locks.includes(lockingEl)) {
-    locks.push(lockingEl);
-    document.body.classList.add('sl-scroll-lock');
-  }
+  locks.add(lockingEl);
+  document.body.classList.add('sl-scroll-lock');
 }
 
 //
 // Unlocks body scrolling. Scrolling will only be unlocked once all elements that requested a lock call this method.
 //
 export function unlockBodyScrolling(lockingEl: HTMLElement) {
-  locks = locks.filter(el => el !== lockingEl);
+  locks.delete(lockingEl);
 
-  if (locks.length === 0) {
+  if (locks.size === 0) {
     document.body.classList.remove('sl-scroll-lock');
   }
 }