diff --git a/Casks/mercurymover.rb b/Casks/mercurymover.rb
index dda7d79d9c3..9c5650cc5e6 100644
--- a/Casks/mercurymover.rb
+++ b/Casks/mercurymover.rb
@@ -6,4 +6,5 @@ class Mercurymover < Cask
   homepage 'http://www.heliumfoot.com/mercurymover'
 
   prefpane 'MercuryMover.prefPane'
+  zap :files => '~/Library/Preferences/com.heliumfoot.MyWiAgent.plist'
 end