diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6c8c52e..b15e5ed 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,5 +16,6 @@ jobs:
           go-version-file: go.mod
       - run: go build ./...
       - run: go vet ./...
-      - run: test -z "$(gofmt -l .)"
+      # gofmt only our code — vendor/ is third-party and not ours to format.
+      - run: test -z "$(gofmt -l cmd internal)"
       - run: go test ./...