diff --git a/.github/workflows/blacklist-command.yml b/.github/workflows/blacklist-command.yml
index 4d0ff5f3..35e53677 100644
--- a/.github/workflows/blacklist-command.yml
+++ b/.github/workflows/blacklist-command.yml
@@ -21,7 +21,8 @@ concurrency:
 
 jobs:
   blacklist:
-    if: startsWith(github.event.issue.title, 'blacklist:')
+    # Upstream only: forks have no <fork>.wiki repository to push to.
+    if: github.repository == 'acmesh-official/acme.sh' && startsWith(github.event.issue.title, 'blacklist:')
     runs-on: ubuntu-latest
     steps:
       - name: Check authorization
diff --git a/.github/workflows/revert-command.yml b/.github/workflows/revert-command.yml
index 7a792bf4..03161bbb 100644
--- a/.github/workflows/revert-command.yml
+++ b/.github/workflows/revert-command.yml
@@ -21,7 +21,8 @@ concurrency:
 
 jobs:
   revert:
-    if: startsWith(github.event.issue.title, 'revert:')
+    # Upstream only: forks have no <fork>.wiki repository to push to.
+    if: github.repository == 'acmesh-official/acme.sh' && startsWith(github.event.issue.title, 'revert:')
     runs-on: ubuntu-latest
     steps:
       - name: Check authorization