diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3ccfedd43..492c977bf 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -84,7 +84,7 @@ jobs:
 
   # build and push image to docker hub.
   build-docker-image:
-    if: github.event_name == push && (github.ref == refs/heads/master || github.ref == refs/heads/dev || github.ref == refs/tags/ng-*)
+    if: github.event_name == "push" && (github.ref == "refs/heads/master" || github.ref == "refs/heads/dev" || github.ref == "refs/tags/ng-*")
     runs-on: ubuntu-latest
     needs: tests
     steps: