diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 45b56faf5cdc..ec3768a81058 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -219,7 +219,7 @@ struct perf_event_attr {
 #define PERF_EVENT_IOC_DISABLE		_IO ('$', 1)
 #define PERF_EVENT_IOC_REFRESH		_IO ('$', 2)
 #define PERF_EVENT_IOC_RESET		_IO ('$', 3)
-#define PERF_EVENT_IOC_PERIOD		_IOW('$', 4, u64)
+#define PERF_EVENT_IOC_PERIOD		_IOW('$', 4, __u64)
 #define PERF_EVENT_IOC_SET_OUTPUT	_IO ('$', 5)
 #define PERF_EVENT_IOC_SET_FILTER	_IOW('$', 6, char *)