diff --git a/utils/launcher/waf-launcher/Main.cs b/utils/launcher/waf-launcher/Main.cs
index 780254f7..640402be 100644
--- a/utils/launcher/waf-launcher/Main.cs
+++ b/utils/launcher/waf-launcher/Main.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Diagnostics;
 
 namespace waflauncher