diff --git a/.github/workflows/documentation-build.yml b/.github/workflows/documentation-build.yml
index 5933aba37..899c65c9c 100644
--- a/.github/workflows/documentation-build.yml
+++ b/.github/workflows/documentation-build.yml
@@ -19,6 +19,8 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v6
+        with:
+          submodules: recursive
 
       - name: Install Doxygen and Graphviz
         run: sudo apt-get install -y doxygen graphviz