diff --git a/.github/workflows/mac.yml b/.github/workflows/mac.yml
index 798beb50a..2a129a9d9 100644
--- a/.github/workflows/mac.yml
+++ b/.github/workflows/mac.yml
@@ -9,6 +9,8 @@ on:
 
 jobs:
   test:
+    # AppleClang doesn't support std::execution, so Scorpion skips the workflow.
+    if: github.repository == 'aibasel/downward'
     name: Compile and test planner
     timeout-minutes: 60
     runs-on: ${{ matrix.version.macos }}