diff --git a/.github/workflows/unittests.yaml b/.github/workflows/unittests.yaml
index b24561f..59161b6 100644
--- a/.github/workflows/unittests.yaml
+++ b/.github/workflows/unittests.yaml
@@ -24,6 +24,7 @@ jobs:
       uses: actions/checkout@v4
       with:
         ref: ${{ github.head_ref }}
+        submodules: recursive  # Ensures submodules are cloned
 
     - name: Set up Python
       uses: actions/setup-python@v5