diff --git a/.github/workflows/pre-pull-images.yaml b/.github/workflows/pre-pull-images.yaml
index e71344bfba4d6..94f32bcb4fcc3 100644
--- a/.github/workflows/pre-pull-images.yaml
+++ b/.github/workflows/pre-pull-images.yaml
@@ -148,7 +148,7 @@ jobs:
           images=$(jq --compact-output --null-input \
               --argjson f1 '${{ needs.default-images.outputs.images }}' \
               --argjson f2 '${{ needs.pull-request-images.outputs.images }}' \
-              '($f1 - $f2) + ($f2 - $f1)' \
+              '$f2 - $f1' \
           )
           echo "images=${images}" >> $GITHUB_OUTPUT
           echo "${images}"