diff --git a/appveyor.yml b/appveyor.yml
index 5c5d8b3246..1b10d99b4a 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -11,6 +11,7 @@ environment:
 install:
   - if not exist gtk-sharp-2.12.26.msi appveyor DownloadFile http://download.xamarin.com/GTKforWindows/Windows/gtk-sharp-2.12.26.msi
   - msiexec /i gtk-sharp-2.12.26.msi /qn /norestart
+  - cmd: set PATH=%programfiles(x86)%\GtkSharp\2.12\bin\;%PATH%
 
 cache:
   - gtk-sharp-2.12.26.msi