diff --git a/src/seq/seq.c b/src/seq/seq.c
--- a/src/seq/seq.c
+++ b/src/seq/seq.c
@@ -1633,9 +1633,10 @@ void snd_seq_client_info_set_event_filte
 void snd_seq_client_info_set_event_filter(snd_seq_client_info_t *info, unsigned char *filter)
 {
 	assert(info);
-	if (! filter)
+	if (! filter) {
 		info->filter &= ~SNDRV_SEQ_FILTER_USE_EVENT;
-	else {
+		memset(info->event_filter, 0, sizeof(info->event_filter));
+	} else {
 		info->filter |= SNDRV_SEQ_FILTER_USE_EVENT;
 		memcpy(info->event_filter, filter, sizeof(info->event_filter));
 	}