diff --git a/.github/workflows/nightly.yaml b/.github/workflows/nightly.yaml
index 983fc0d9f..c3f239c1a 100644
--- a/.github/workflows/nightly.yaml
+++ b/.github/workflows/nightly.yaml
@@ -4,8 +4,8 @@ name: Test MESSAGEix-GLOBIOM scenarios
 
 on:
   # Uncomment these two lines for debugging, but leave them commented on 'main'
-  pull_request:
-    branches: [ main ]
+  # pull_request:
+  #   branches: [ main ]
   schedule:
   # 05:00 UTC = 06:00 CET = 07:00 CEST
   - cron: "0 5 * * *"