diff --git a/.github/workflows/c-cpp.yml b/.github/workflows/c-cpp.yml
index 5fcd876..63483c1 100644
--- a/.github/workflows/c-cpp.yml
+++ b/.github/workflows/c-cpp.yml
@@ -12,6 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
+    - uses: actions/checkout@v2
     - name: Install Prerequisites
       run: sudo apt-get install -y make binutils-arm-none-eabi gcc-arm-none-eabi gcc-arm-none-eabi-source libnewlib-arm-none-eabi libstdc++-arm-none-eabi-dev libstdc++-arm-none-eabi-newlib libstdc++-arm-none-eabi-picolibc picolibc-arm-none-eabi
     - name: make