diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1022f91ebe..1ab621fcb3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,7 +23,7 @@ jobs:
       # pubspec is satisfied.  It's uncommon for flutter/flutter to go
       # more than 100 commits between tags.  Fetch 1000 for good measure.
       run: |
-        git clone --depth=1000 https://github.com/flutter/flutter ~/flutter
+        git clone --depth=1000 -b main https://github.com/flutter/flutter ~/flutter
         TZ=UTC git --git-dir ~/flutter/.git log -1 --format='%h | %ci | %s' --date=iso8601-local
         echo ~/flutter/bin >> "$GITHUB_PATH"
         git --git-dir ~/flutter/.git remote -v