diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index fd9c3fe4..0884224b 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -25,7 +25,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           
       - name: Sleep for a few seconds.
-        run: sleep(10)
+        run: sleep 10
 
       - name: Create nightly GitHub release
         id: release