diff --git a/appveyor.yml b/appveyor.yml
index c964450..67689dc 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -12,6 +12,7 @@ install:
   - SET PATH=C:\Rust\bin
   - SET PATH=C:\msys64\mingw%BITS%\bin;C:\msys64\usr\bin;%PATH%
   - echo %PATH%
+  - pacman --noconfirm -S mingw-w64-x86_64-gtk3
   - gcc --version
   - rustc -V
   - cargo -V