diff --git a/.github/workflows/c-cpp.yml b/.github/workflows/c-cpp.yml
index f0d09ff..97f9356 100644
--- a/.github/workflows/c-cpp.yml
+++ b/.github/workflows/c-cpp.yml
@@ -13,6 +13,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
+      with:
+        submodules: 'true'
     - name: make
       run: make -j2
     - name: running testsuite