diff --git a/appveyor/install_libzim.cmd b/appveyor/install_libzim.cmd
index 4fe5e41..2985c37 100644
--- a/appveyor/install_libzim.cmd
+++ b/appveyor/install_libzim.cmd
@@ -2,6 +2,7 @@ REM ========================================================
 REM Install libzim
 git clone https://github.com/openzim/libzim.git || exit /b 1
 cd libzim
+git checkout better_wchar_convert
 meson.py . build --prefix %EXTRA_DIR% --default-library static --buildtype release || exit /b 1
 cd build
 ninja || exit /b 1