diff --git a/.github/workflows/test-mlperf-inference-retinanet.yml b/.github/workflows/test-mlperf-inference-retinanet.yml
index 860f23fe6..b65e0d7cd 100644
--- a/.github/workflows/test-mlperf-inference-retinanet.yml
+++ b/.github/workflows/test-mlperf-inference-retinanet.yml
@@ -45,8 +45,11 @@ jobs:
         pip install mlcflow
         pip install tabulate
     - name: Pull MLOps repo
+      env:
+        REPO: ${{ github.event.pull_request.head.repo.html_url }}
+        BRANCH: ${{ github.event.pull_request.head.ref }}
       run: |
-        mlc pull repo ${{ github.event.pull_request.head.repo.html_url }} --branch=${{ github.event.pull_request.head.ref }}
+        mlc pull repo "$REPO" --branch="$BRANCH"
 
     - name: Test MLPerf Inference Retinanet using ${{ matrix.backend }} on ${{ matrix.os }}
       if: matrix.os == 'windows-latest'