diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index 63dba4b..2d52611 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -18,7 +18,7 @@ on:
 
 jobs:
   build:
-    if: github.event.workflow_run.conclusion == 'success'
+    if: ${{ github.event.workflow_run.conclusion == 'success' }}
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4