diff --git a/client/internal/v2/client_test.go b/client/internal/v2/client_test.go
index 83aae018dad..05ebba33641 100644
--- a/client/internal/v2/client_test.go
+++ b/client/internal/v2/client_test.go
@@ -318,7 +318,7 @@ func TestSimpleHTTPClientDoHeaderTimeout(t *testing.T) {
 }
 
 func TestHTTPClusterClientDo(t *testing.T) {
-	fakeErr := errors.New("fake")
+	fakeErr := errors.New("fake!")
 	fakeURL := url.URL{}
 	tests := []struct {
 		client *httpClusterClient