diff --git a/src/iso.c b/src/iso.c
index 76ba13a..0d5aa9f 100644
--- a/src/iso.c
+++ b/src/iso.c
@@ -316,6 +316,14 @@ static int _raw1394_iso_xmit_queue_packets(raw1394handle_t handle)
 		packets.n_packets++;
 
 		if(disp == RAW1394_ISO_DEFER) {
+			/* queue an event so that we don't hang in the next read() */
+			if(ioctl(handle->fd, RAW1394_IOC_ISO_QUEUE_ACTIVITY, 0))
+				goto out_produce;
+			break;
+		} else if(disp == RAW1394_ISO_AGAIN) {
+			/* the last packet was not ready, decrement counter */
+			packets.n_packets--;
+			
 			/* queue an event so that we don't hang in the next read() */
 			if(ioctl(handle->fd, RAW1394_IOC_ISO_QUEUE_ACTIVITY, 0))
 				goto out_produce;
diff --git a/src/raw1394.h b/src/raw1394.h
index 833915f..4f8fa4b 100644
--- a/src/raw1394.h
+++ b/src/raw1394.h
@@ -106,6 +106,11 @@ enum raw1394_iso_disposition {
 
 	/* (transmission only) - like ISO_STOP, but don't wait for the buffer to empty */
 	RAW1394_ISO_STOP_NOSYNC = 4,
+	
+	/* (transmission only) - use this if the data you need for the packet was not ready yet
+	 * The packet queueing will retry at a later point
+	 */
+	RAW1394_ISO_AGAIN = 5,
 };
 
 enum raw1394_modify_mode {