diff --git a/scaffolder-skeletons/ci_schedule/.github/workflows/schedule.yaml b/scaffolder-skeletons/ci_schedule/.github/workflows/schedule.yaml
index 0e764cc..47d274b 100644
--- a/scaffolder-skeletons/ci_schedule/.github/workflows/schedule.yaml
+++ b/scaffolder-skeletons/ci_schedule/.github/workflows/schedule.yaml
@@ -10,5 +10,5 @@ jobs:
   schedule-trivy:
     uses: radiorabe/actions/.github/workflows/schedule-trivy.yaml@${{ values.actions_version }}
     with:
-      image-ref: ${{ values.trivy_image_ref }}
+      image-ref: '${{ values.trivy_image_ref }}'
 {%- endif %}