diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index 0a0f266..cbccf96 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -14,6 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
+      with:
       submodules: recursive
     - name: Install packages
       run: sudo .ci/ubuntu_install.sh