diff --git a/vet.sh b/vet.sh
index 5c831df7c..94a50640b 100755
--- a/vet.sh
+++ b/vet.sh
@@ -124,7 +124,7 @@ done
 ### END HACK HACK HACK
 
 # TODO(menghanl): fix errors in transport_test.
-staticcheck -ignore '
+staticcheck -go 1.9 -ignore '
 balancer.go:SA1019
 balancer_test.go:SA1019
 clientconn_test.go:SA1019