diff --git a/.github/workflows/diff-cdktf-stacks.yml b/.github/workflows/diff-cdktf-stacks.yml
index 42f5690..8543d05 100644
--- a/.github/workflows/diff-cdktf-stacks.yml
+++ b/.github/workflows/diff-cdktf-stacks.yml
@@ -66,7 +66,7 @@ jobs:
               stackName: "${{matrix.stack}}" 
             })
       - name: Fail this check if the plan was not successful
-        if: ${{ steps.plan.outcome != "success" }}
+        if: ${{ steps.plan.outcome }} != 'success'
         uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
         with:
           script: |