diff --git a/.github/workflows/pull_request_full_build.yml b/.github/workflows/pull_request_full_build.yml
index 405c34b97789..e937baa0976f 100644
--- a/.github/workflows/pull_request_full_build.yml
+++ b/.github/workflows/pull_request_full_build.yml
@@ -139,6 +139,10 @@ jobs:
           distribution: 'temurin'
           java-version: '21.0.3'
 
+      - name: Checkout non-default branch
+        run: |
+          git fetch origin && git checkout -t origin/java21
+
       - name: Download Ballerina Lang Artifacts
         uses: actions/download-artifact@v4
         with: