diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 2d2733db..a23bf26b 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -81,7 +81,7 @@ jobs:
         pushd libcalc
         mkdir build
         pushd build
-        D:\a\_temp\setup-msys2\msys2.CMD -c 'cmake -DCMAKE_PREFIX_PATH=$CONDA_PREFIX -DCMAKE_INSTALL_PREFIX=$CONDA_PREFIX ..'
+        D:\a\_temp\setup-msys2\msys2.CMD -c 'cmake -DCMAKE_PREFIX_PATH=$CONDA_PREFIX -DCMAKE_INSTALL_PREFIX=$CONDA_PREFIX -G ''MSYS Makefiles'' ..'
         D:\a\_temp\setup-msys2\msys2.CMD -c "cmake --build ."
         D:\a\_temp\setup-msys2\msys2.CMD -c "cmake --install ."
         popd