--- uae/src/sd-sgi/sound.c	2018/04/24 16:45:20	1.1.1.1
+++ uae/src/sd-sgi/sound.c	2018/04/24 16:58:58	1.1.1.2
@@ -12,6 +12,7 @@
 #include "config.h"
 #include "options.h"
 #include "memory.h"
+#include "events.h"
 #include "custom.h"
 #include "audio.h"
 #include "gensound.h"
@@ -112,7 +113,8 @@ int init_sound(void)
 		return 0;
 	}
 
-	sample_evtime = (long)maxhpos * maxvpos * 50 / rate;
+ 	scaled_sample_evtime = (unsigned long)maxhpos * maxvpos * vblank_hz * CYCLE_UNIT / rate;
+ 	scaled_sample_evtime_ok = 1;
 
 	sndbufpt = sndbuffer;
 	if (width == AL_SAMPLE_16) {