diff --git a/packages/global-registrator/src/GlobalRegistrator.ts b/packages/global-registrator/src/GlobalRegistrator.ts
index db03c78c7..0a0c2329d 100644
--- a/packages/global-registrator/src/GlobalRegistrator.ts
+++ b/packages/global-registrator/src/GlobalRegistrator.ts
@@ -25,7 +25,11 @@ export default class GlobalRegistrator {
 			if (global[key] !== window[key] && !IGNORE_LIST.includes(key)) {
 				this.registered[key] =
 					global[key] !== window[key] && global[key] !== undefined ? global[key] : null;
-				global[key] = typeof window[key] === 'function' ? window[key].bind(global) : window[key];
+
+				// Only bind functions that aren't used as classes, since bound functions can't be extended.
+				const bind = typeof window[key] === 'function' && !isClassLikeName(key);
+
+				global[key] = bind ? window[key].bind(global) : window[key];
 			}
 		}
 
@@ -56,3 +60,7 @@ export default class GlobalRegistrator {
 		this.registered = null;
 	}
 }
+
+function isClassLikeName(name: string): boolean {
+	return name[0] === name[0].toUpperCase();
+}