diff --git a/.github/workflows/lock.yml b/.github/workflows/lock.yml
index 9bce72248..e6765da99 100644
--- a/.github/workflows/lock.yml
+++ b/.github/workflows/lock.yml
@@ -16,6 +16,7 @@ concurrency:
 jobs:
   action:
     runs-on: ubuntu-latest
+    if: github.repository == 'tmux/tmux'
     steps:
       - uses: dessant/lock-threads@v6
         with:
diff --git a/.github/workflows/regress.yml b/.github/workflows/regress.yml
index 95935f2f8..3cc036425 100644
--- a/.github/workflows/regress.yml
+++ b/.github/workflows/regress.yml
@@ -16,6 +16,7 @@ jobs:
   regress:
     name: ${{ matrix.name }}
     runs-on: ${{ matrix.runner }}
+    if: github.repository == 'tmux/tmux'
     timeout-minutes: 45
 
     strategy: