diff --git a/Flow.Launcher.Plugin/EventHandler.cs b/Flow.Launcher.Plugin/EventHandler.cs
index 78e4bd4ed..893b0ba80 100644
--- a/Flow.Launcher.Plugin/EventHandler.cs
+++ b/Flow.Launcher.Plugin/EventHandler.cs
@@ -1,4 +1,5 @@
-using System.Windows;
+using System;
+using System.Windows;
 using System.Windows.Input;
 
 namespace Flow.Launcher.Plugin