diff --git a/spa/plugins/alsa/alsa-seq.c b/spa/plugins/alsa/alsa-seq.c
index f5065999e..5fc269ce0 100644
--- a/spa/plugins/alsa/alsa-seq.c
+++ b/spa/plugins/alsa/alsa-seq.c
@@ -137,6 +137,13 @@ static int init_stream(struct seq_state *state, enum spa_direction direction)
 	return 0;
 }
 
+static int uninit_stream(struct seq_state *state, enum spa_direction direction)
+{
+	struct seq_stream *stream = &state->streams[direction];
+	snd_midi_event_free(stream->codec);
+	return 0;
+}
+
 static void init_ports(struct seq_state *state)
 {
 	snd_seq_addr_t addr;
@@ -324,6 +331,9 @@ int spa_alsa_seq_close(struct seq_state *state)
 	seq_close(state, &state->sys);
 	seq_close(state, &state->event);
 
+	uninit_stream(state, SPA_DIRECTION_INPUT);
+	uninit_stream(state, SPA_DIRECTION_OUTPUT);
+
 	spa_system_close(state->data_system, state->timerfd);
 	state->opened = false;