diff --git a/.github/workflows/pull-request-merged.yml b/.github/workflows/pull-request-merged.yml
index 9d493099cb..8d6eda8843 100644
--- a/.github/workflows/pull-request-merged.yml
+++ b/.github/workflows/pull-request-merged.yml
@@ -29,6 +29,6 @@ jobs:
             "PROWLER_COMMIT_SHA": "${{ github.sha }}",
             "PROWLER_COMMIT_SHORT_SHA": "${{ env.SHORT_SHA }}",
             "PROWLER_PR_TITLE": "${{ github.event.pull_request.title }}",
-            "PROWLER_PR_LABELS": ${{ github.event.pull_request.labels }},
+            "PROWLER_PR_LABELS": ${{ toJson(github.event.pull_request.labels) }},
             "PROWLER_PR_BODY": ${{ toJson(github.event.pull_request.body) }}
           }'