diff --git a/src/ibm.h b/src/ibm.h
index 4d7cc59..798331e 100644
--- a/src/ibm.h
+++ b/src/ibm.h
@@ -448,7 +448,7 @@ float VGACONST1,VGACONST2;
 float RTCCONST;
 int gated,speakval,speakon;
 
-#define SOUNDBUFLEN (48000/40)
+#define SOUNDBUFLEN (48000/20)
 
 
 /*Sound Blaster*/