diff --git a/src/gui/midi.cpp b/src/gui/midi.cpp
index 7360faa5..a3a29823 100644
--- a/src/gui/midi.cpp
+++ b/src/gui/midi.cpp
@@ -42,8 +42,9 @@ Bit8u MIDI_evt_len[256] = {
 
   0,2,3,2, 0,0,1,1, 1,0,1,1, 1,0,1,1   // 0xf0
 };
- 
 
+#define SYSEX_SIZE 1024
+ 
 #if defined (WIN32)
 
 #include "midi_win32.h"
@@ -69,7 +70,7 @@ static struct {
 	Bit32u cmd_msg;
 	Bit8u data[4];
 	struct {
-		Bit8u buf[256];
+		Bit8u buf[SYSEX_SIZE];
 		Bitu used;
 		bool active;
 	} sysex;
@@ -80,7 +81,7 @@ static struct {
 void MIDI_RawOutByte(Bit8u data) {
 	/* Test for a new status byte */
 	if (midi.sysex.active && !(data&0x80)) {
-		if (midi.sysex.used<256) midi.sysex.buf[midi.sysex.used++]=data;
+		if (midi.sysex.used<(SYSEX_SIZE-1)) midi.sysex.buf[midi.sysex.used++]=data;
 		return;
 	} else if (data&0x80) {
 		if (midi.sysex.active) {
diff --git a/src/gui/midi_oss.h b/src/gui/midi_oss.h
index 2141392d..a45e25bc 100644
--- a/src/gui/midi_oss.h
+++ b/src/gui/midi_oss.h
@@ -23,7 +23,7 @@ static int m_device;
 #define SEQ_MIDIPUTC    5
 
 static void MIDI_PlaySysex(Bit8u * sysex,Bitu len) {
-	Bit8u buf[1024];Bitu pos=0;
+	Bit8u buf[SYSEX_SIZE*4];Bitu pos=0;
 	for (;len>0;len--) {
 		buf[pos++] = SEQ_MIDIPUTC;
 		buf[pos++] = *sysex++;
diff --git a/src/gui/midi_win32.h b/src/gui/midi_win32.h
index 5501e53c..5f30c293 100644
--- a/src/gui/midi_win32.h
+++ b/src/gui/midi_win32.h
@@ -24,7 +24,6 @@ static HMIDIOUT m_out;
 static MIDIHDR m_hdr;
 static HANDLE m_event;
 
-static Bit8u m_msg[300];
 
 static void MIDI_PlaySysex(Bit8u * sysex,Bitu len) {
 
@@ -33,9 +32,8 @@ static void MIDI_PlaySysex(Bit8u * sysex,Bitu len) {
 		return;
 	}		
 	midiOutUnprepareHeader (m_out, &m_hdr, sizeof (m_hdr));
-	memcpy (&m_msg, sysex, len);
 
-	m_hdr.lpData = (char *) m_msg;
+	m_hdr.lpData = (char *) sysex;
 	m_hdr.dwBufferLength = len ;
 	m_hdr.dwBytesRecorded = len ;
 	m_hdr.dwUser = 0;