diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 9c6570ff6..b473ac8f6 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -81,16 +81,19 @@ jobs:
         conda info
 
     - name: Get additional sources
+      shell: cmd
       run: |
         git clone --depth 1 https://github.com/rcsb/mmtf-cpp.git
         cp -R mmtf-cpp/include/mmtf* include/
 
     - name: Build PyMOL
+      shell: cmd
       run: |
         CALL %CONDA_ROOT%\\Scripts\\activate.bat
         python setup.py --testing install --prefix=install-prefix
 
     - name: Test
+      shell: cmd
       run: |
         CALL %CONDA_ROOT%\\Scripts\\activate.bat
         ./install-prefix/bin/pymol -ckqy testing/testing.py --run all