diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index 36901f6..342ef1c 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -4,7 +4,6 @@ on:
   push:
     branches:
       - main
-      - master
   pull_request:
   workflow_dispatch:
 
@@ -15,6 +14,9 @@ jobs:
   flake-check:
     name: Flake Check
     runs-on: [self-hosted, nix-builder]
+    # Only auto-run on main branch, PRs require workflow_dispatch
+    if: gitea.event_name == 'push' && gitea.ref == 'refs/heads/main'
+    needs: [format-check]
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4