diff --git a/.github/workflows/flaskr-ci.yaml b/.github/workflows/flaskr-ci.yaml
index 3553ccb6..13cf8df0 100644
--- a/.github/workflows/flaskr-ci.yaml
+++ b/.github/workflows/flaskr-ci.yaml
@@ -38,7 +38,7 @@ jobs:
   # Build Docker image in a separate job so that it's not tainted by cached build/test files
   build-image:
     needs: tests
-    if: github.event_name == "pull_request"
+    if: ${{ github.event_name == "pull_request" }}
     permissions:
       # Required permission to push images with the built-in GITHUB_TOKEN
       packages: write