diff --git a/tools/perf/tests/event_update.c b/tools/perf/tests/event_update.c
index 012eab5d1df115e7cbeb7d8a505a46d0e43f854a..63ecf21750eb0dca6e865cb90a57905df1fb566e 100644
--- a/tools/perf/tests/event_update.c
+++ b/tools/perf/tests/event_update.c
@@ -30,7 +30,7 @@ static int process_event_scale(struct perf_tool *tool __maybe_unused,
 
 	TEST_ASSERT_VAL("wrong id", ev->id == 123);
 	TEST_ASSERT_VAL("wrong id", ev->type == PERF_EVENT_UPDATE__SCALE);
-	TEST_ASSERT_VAL("wrong scale", ev_data->scale = 0.123);
+	TEST_ASSERT_VAL("wrong scale", ev_data->scale == 0.123);
 	return 0;
 }