diff --git a/include/rawmidi.h b/include/rawmidi.h
index 32bbdace..20ab4056 100644
--- a/include/rawmidi.h
+++ b/include/rawmidi.h
@@ -31,6 +31,8 @@ typedef enum _snd_rawmidi_stream {
 #define SND_RAWMIDI_APPEND	1
 /** Non blocking mode \hideinitializer */
 #define SND_RAWMIDI_NONBLOCK	2
+/** Write sync mode \hideinitializer */
+#define SND_RAWMIDI_SYNC	4
 
 /** RawMidi handle */
 typedef struct _snd_rawmidi snd_rawmidi_t;
diff --git a/src/rawmidi/rawmidi_hw.c b/src/rawmidi/rawmidi_hw.c
index 206ca47d..949b35b3 100644
--- a/src/rawmidi/rawmidi_hw.c
+++ b/src/rawmidi/rawmidi_hw.c
@@ -208,6 +208,10 @@ int snd_rawmidi_hw_open(snd_rawmidi_t **inputp, snd_rawmidi_t **outputp,
 	if (mode & SND_RAWMIDI_NONBLOCK) {
 		fmode |= O_NONBLOCK;
 	}
+	
+	if (mode & SND_RAWMIDI_SYNC) {
+		fmode |= O_SYNC;
+	}
 
 	assert(!(mode & ~(SND_RAWMIDI_APPEND|SND_RAWMIDI_NONBLOCK)));