diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b0a6048a..395a57e1 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -9,7 +9,6 @@ on:
 defaults:
   run:
     shell: bash
-    working-directory: ..
 
 jobs:
   build:
@@ -18,6 +17,11 @@ jobs:
       matrix:
         os: [ubuntu-16.04, ubuntu-18.04, ubuntu-20.04, macos-10.15, windows-2019, windows-2016]
     steps:
+      - uses: actions/checkout@master
+        with:
+          persist-credentials: false
+          fetch-depth: 0
+
       - name: Before Build
         run: |
              export GAMOS=$"${RUNNER_OS,,}"
@@ -30,4 +34,5 @@ jobs:
              pwd
              echo "ls"
              ls -al
+             cd GAM/src
              source travis/${GAMOS}-before-install.sh