diff --git a/.github/workflows/auto-label.yml b/.github/workflows/auto-label.yml
index 71b8b605..5feff289 100644
--- a/.github/workflows/auto-label.yml
+++ b/.github/workflows/auto-label.yml
@@ -37,7 +37,7 @@ jobs:
 
   # PRs: label so the project rule moves them to In Progress
   label-prs:
-    if: github.event_name == 'pull_request'
+    if: github.event_name == 'pull_request' && !github.event.pull_request.head.repo.fork
     runs-on: ubuntu-latest
     steps:
       - name: Add iris + in-progress labels to PR
@@ -49,4 +49,5 @@ jobs:
               repo: context.repo.repo,
               issue_number: context.payload.pull_request.number,
               labels: ["iris", "in-progress"]
-            });
+            })
+