diff --git a/src/components/ui/rich-text-editor.tsx b/src/components/ui/rich-text-editor.tsx
index acc68a5..7235c7f 100644
--- a/src/components/ui/rich-text-editor.tsx
+++ b/src/components/ui/rich-text-editor.tsx
@@ -269,12 +269,10 @@ const TicketMentionExtension = Mention.extend({
     }
   },
   addKeyboardShortcuts() {
-    const mentionPrototype = Mention as unknown as {
-      prototype: { addKeyboardShortcuts?: (this: unknown) => unknown }
-    }
-    const parentShortcuts = mentionPrototype.prototype.addKeyboardShortcuts?.call(this) as
-      | Record<string, (args: { editor: Editor }) => boolean>
-      | undefined
+    // Reuse base Mention keyboard shortcuts when extending the extension.
+    const parentShortcuts = (this as unknown as {
+      parent?: () => Record<string, (args: { editor: Editor }) => boolean>
+    }).parent?.()
     const parent = parentShortcuts ?? {}
     return {
       ...parent,