diff --git a/sc2/src/sc2code/libs/callback/alarm.h b/sc2/src/sc2code/libs/callback/alarm.h
index 8fcef79e4..54e0e7a2f 100644
--- a/sc2/src/sc2code/libs/callback/alarm.h
+++ b/sc2/src/sc2code/libs/callback/alarm.h
@@ -31,7 +31,7 @@ alarmTimeToMsUint32(AlarmTime time) {
 
 typedef struct Alarm Alarm;
 typedef void *AlarmCallbackArg;
-typedef void (*AlarmCallback)(AlarmCallbackArg *arg);
+typedef void (*AlarmCallback)(AlarmCallbackArg arg);
 
 struct Alarm {
 	size_t index;