diff --git a/src/audio/mockingboard.c b/src/audio/mockingboard.c
index 764d9716..882ca35e 100644
--- a/src/audio/mockingboard.c
+++ b/src/audio/mockingboard.c
@@ -1699,7 +1699,7 @@ void MB_Initialize()
 {
 #ifdef APPLE2IX
     assert(pthread_self() == cpu_thread_id);
-    memset(SSI263Voice, 0x0, sizeof(AudioBuffer_s)*MAX_VOICES);
+    memset(SSI263Voice, 0x0, sizeof(AudioBuffer_s *) * MAX_VOICES);
 #endif
 	if (g_bDisableDirectSoundMockingboard)
 	{