diff --git a/.github/workflows/doxygen.yml b/.github/workflows/doxygen.yml
index daaf770..f01faa8 100644
--- a/.github/workflows/doxygen.yml
+++ b/.github/workflows/doxygen.yml
@@ -10,6 +10,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          submodules: true
 
       - name: Build documentation
         uses: mattnotmitt/doxygen-action@v1.9.5