diff --git a/.github/workflows/doc.yml b/.github/workflows/doc.yml
index f31175b6..c10d1ee4 100644
--- a/.github/workflows/doc.yml
+++ b/.github/workflows/doc.yml
@@ -65,6 +65,7 @@ jobs:
             fi
           }
           source doc/_readme/scripts/install_llgo.sh
+          echo "LLGO_ROOT=$GITHUB_WORKSPACE" >> $GITHUB_ENV
 
       - name: Test doc code blocks
         run: |