diff --git a/.github/workflows/test-build.yml b/.github/workflows/test-build.yml
index 662e189bcd8..fcd5f6266ab 100644
--- a/.github/workflows/test-build.yml
+++ b/.github/workflows/test-build.yml
@@ -192,6 +192,8 @@ jobs:
     steps:
       - name: Checkout Yosys
         uses: actions/checkout@v4
+        with:
+          submodules: true
 
       - name: Runtime environment
         run: |