diff --git a/google/internal/externalaccount/oauth/err_test.go b/google/internal/externalaccount/oauth/err_test.go
index deb6c5b..6ceb0c9 100644
--- a/google/internal/externalaccount/oauth/err_test.go
+++ b/google/internal/externalaccount/oauth/err_test.go
@@ -8,7 +8,7 @@ func TestError_Generator(t *testing.T) {
 		"http:thisIsAPlaceholder",
 		"The Answer!",
 	}
-	want := "got error code " + "42" + " from " + "http:thisIsAPlaceholder" + ": " + "The Answer!"
+	want := "got error code 42 from http:thisIsAPlaceholder: The Answer!"
 	if got := e.Error(); got != want {
 		t.Errorf("Got error message %q; want %q", got, want)
 	}