diff --git a/packages/docusaurus/src/client/exports/isInternalUrl.ts b/packages/docusaurus/src/client/exports/isInternalUrl.ts
index c68ce38be6..134f0336a3 100644
--- a/packages/docusaurus/src/client/exports/isInternalUrl.ts
+++ b/packages/docusaurus/src/client/exports/isInternalUrl.ts
@@ -6,5 +6,5 @@
  */
 
 export default function isInternalUrl(url: string): boolean {
-  return /^(https?:|\/\/|mailto:|tel:)/.test(url) === false;
+  return /^(\w*:|\/\/)/.test(url) === false;
 }