diff --git a/.github/workflows/build-stls.yml b/.github/workflows/build-stls.yml
index 0f98845..25b323d 100644
--- a/.github/workflows/build-stls.yml
+++ b/.github/workflows/build-stls.yml
@@ -11,6 +11,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
+        with:
+          submodules: true
       - name: Generate Models
         uses: pkoehlers/openscad-build-action@54267e4b137c716efa15a48bd53f743a23fea606
         with: