diff --git a/lib/vscode/src/vs/server/node/channel.ts b/lib/vscode/src/vs/server/node/channel.ts
index 3105c809d..fa27ac433 100644
--- a/lib/vscode/src/vs/server/node/channel.ts
+++ b/lib/vscode/src/vs/server/node/channel.ts
@@ -907,5 +907,5 @@ function transformIncoming(remoteAuthority: string, uri: UriComponents | undefin
 }
 
 function isDefined<T>(t: T | undefined): t is T {
-	return typeof t !== "undefined";
+	return typeof t !== 'undefined';
 }