diff --git a/.github/workflows/pytest.yaml b/.github/workflows/pytest.yaml
index fdc516e54..085f1f34e 100644
--- a/.github/workflows/pytest.yaml
+++ b/.github/workflows/pytest.yaml
@@ -89,6 +89,7 @@ jobs:
     - uses: iiasa/actions/setup-gams@enh/gams-macos-arm64
       with:
         version: ${{ matrix.gams-version }}
+        license: ${{ secrets.GAMS_LICENSE }}
 
     - name: Set RETICULATE_PYTHON
       # Use the environment variable set by the setup-python action, above.