diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index e6ee0d813783..587ea1eb3197 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -635,6 +635,7 @@ int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 		kfree(runtime->buffer);
 		runtime->buffer = newbuf;
 		runtime->buffer_size = params->buffer_size;
+		runtime->avail = runtime->buffer_size;
 	}
 	runtime->avail_min = params->avail_min;
 	substream->active_sensing = !params->no_active_sensing;