diff --git a/extensions/gulp/src/main.ts b/extensions/gulp/src/main.ts
index cde1116d3ef..0314dc44fde 100644
--- a/extensions/gulp/src/main.ts
+++ b/extensions/gulp/src/main.ts
@@ -83,7 +83,7 @@ class FolderDetector {
 	}
 
 	public start(): void {
-		let pattern = path.join(this._workspaceFolder.uri.fsPath, 'gulpfile{.babel.js,.js}');
+		let pattern = path.join(this._workspaceFolder.uri.fsPath, 'gulpfile{.babel.js,.js,.ts}');
 		this.fileWatcher = vscode.workspace.createFileSystemWatcher(pattern);
 		this.fileWatcher.onDidChange(() => this.promise = undefined);
 		this.fileWatcher.onDidCreate(() => this.promise = undefined);