diff --git a/Rectify11Installer/Core/Backend/Themes.cs b/Rectify11Installer/Core/Backend/Themes.cs
index ba60ef642..ba69d6e72 100644
--- a/Rectify11Installer/Core/Backend/Themes.cs
+++ b/Rectify11Installer/Core/Backend/Themes.cs
@@ -133,6 +133,9 @@ public static bool Uninstall()
 
                 UninstallMfe();
 
+                // kill tray tool
+                Helper.KillProcess("rectify11traytool.exe");
+
                 try
                 {
                     var key = Registry.ClassesRoot.OpenSubKey(@"CLSID", true);