diff --git a/.github/workflows/xcodebuild.yml b/.github/workflows/xcodebuild.yml
index adf30dd..f00a7a3 100644
--- a/.github/workflows/xcodebuild.yml
+++ b/.github/workflows/xcodebuild.yml
@@ -13,6 +13,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+      with:
+        submodules: true
     - name: brew
       run: brew install ragel
     - name: xcodebuild