diff --git a/.github/workflows/test-core.yml b/.github/workflows/test-core.yml
index da196cdf94bc..30d3d658d320 100644
--- a/.github/workflows/test-core.yml
+++ b/.github/workflows/test-core.yml
@@ -24,7 +24,7 @@ jobs:
     name: Units + Features
     if: github.repository == 'opf/openproject'
     runs-on:
-      labels
+      labels:
         - runs-on
         - runner=32cpu-linux-x64
         - family=m7