diff --git a/.github/workflows/MacOS_Build.yml b/.github/workflows/MacOS_Build.yml
index 99fd1b21..4007e0e9 100644
--- a/.github/workflows/MacOS_Build.yml
+++ b/.github/workflows/MacOS_Build.yml
@@ -19,6 +19,7 @@ jobs:
     runs-on: macos-latest
 
     steps:
+    - uses: actions/checkout@v2
     - name: Fetch submodules
       run: git submodule update --init --recursive