diff --git a/Casks/m/mono-mdk.rb b/Casks/m/mono-mdk.rb
index b9deebf9d10b6..a62c24a0ed848 100644
--- a/Casks/m/mono-mdk.rb
+++ b/Casks/m/mono-mdk.rb
@@ -12,7 +12,7 @@
     regex(%r{href=.*?/MonoFramework-MDK-(\d+(?:\.\d+)+).macos10.xamarin.universal\.pkg}i)
   end
 
-  conflicts_with cask:    "homebrew/cask-versions/mono-mdk-for-visual-studio",
+  conflicts_with cask:    "mono-mdk-for-visual-studio",
                  formula: "mono"
 
   pkg "MonoFramework-MDK-#{version}.macos10.xamarin.universal.pkg"