diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d503679..4c939c3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,6 +24,7 @@ jobs:
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - uses: actions/checkout@v2
+        submodules: 'recursive'
 
       - name: Install kcov
         run: sudo apt-get install -y kcov