diff --git a/extensions/markdown/src/extension.ts b/extensions/markdown/src/extension.ts
index 72df306d8bb..2961bfa3745 100644
--- a/extensions/markdown/src/extension.ts
+++ b/extensions/markdown/src/extension.ts
@@ -242,6 +242,7 @@ export function activate(context: vscode.ExtensionContext) {
 			}
 		};
 	}
+	return undefined;
 }