diff --git a/src/server/server.ts b/src/server/server.ts
index 17d7e15c19d..c9f807778c1 100644
--- a/src/server/server.ts
+++ b/src/server/server.ts
@@ -292,6 +292,8 @@ namespace ts.server {
 
     sys.setTimeout = setTimeout;
     sys.clearTimeout = clearTimeout;
+    sys.setImmediate = setImmediate;
+    sys.clearImmediate = clearImmediate;
 
     let cancellationToken: HostCancellationToken;
     try {