diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index 14ca984..c9eaf67 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -14,6 +14,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
+      with: 
+      - submodules: recursive
     - name: Install packages
       run: sudo .ci/ubuntu_install.sh
     - name: Configure CMake