diff --git a/modules/git/blame.go b/modules/git/blame.go
index 9aa77dc65b131..ed7156d38d029 100644
--- a/modules/git/blame.go
+++ b/modules/git/blame.go
@@ -122,6 +122,8 @@ func createBlameReader(ctx context.Context, dir string, command ...string) (*Bla
 	pid := process.GetManager().Add(fmt.Sprintf("GetBlame [repo_path: %s]", dir), cancel)
 
 	scanner := bufio.NewScanner(stdout)
+	buf := make([]byte, 0, bufio.MaxScanTokenSize)
+	scanner.Buffer(buf, 1024*1024)
 
 	return &BlameReader{
 		cmd,