diff --git a/build.gradle b/build.gradle
index bd483d3f950c97009fd13ed844a1d810a35199b9..708a66b63c6acf61432e1d262ca6e9cf7740596a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -74,6 +74,9 @@ rat {
     "**/apache_beam/portability/api/*_pb2*.py",
     "**/go/pkg/beam/**/*.pb.go",
 
+    // Ignore go.sum files, which don't permit headers
+    "**/go.sum",
+
     // Ignore Go test data files
     "**/go/data/**",