diff --git a/.github/workflows/docker-image.yml b/.github/workflows/docker-image.yml
index e91168d..9da214f 100644
--- a/.github/workflows/docker-image.yml
+++ b/.github/workflows/docker-image.yml
@@ -28,7 +28,7 @@ jobs:
         run: tests/run
 
   push:
-    if: ${{ github.event_name == "push" && github.ref == "master" }}
+    if: github.event_name == "push" && github.ref == "refs/heads/master"
     needs: test
 
     runs-on: ubuntu-latest