diff --git a/seq/aconnect/aconnect.c b/seq/aconnect/aconnect.c
index a02f43f..47ad61b 100644
--- a/seq/aconnect/aconnect.c
+++ b/seq/aconnect/aconnect.c
@@ -237,6 +237,8 @@ static void remove_connection(snd_seq_t *seq, snd_seq_client_info_t *cinfo,
 		snd_seq_port_subscribe_t subs;
 		if (snd_seq_get_any_port_info(seq, query.addr.client, query.addr.port, &port) < 0)
 			continue;
+		if (!(port.capability & SND_SEQ_PORT_CAP_SUBS_READ))
+			continue;
 		if (port.capability & SND_SEQ_PORT_CAP_NO_EXPORT)
 			continue;
 		memset(&subs, 0, sizeof(subs));
@@ -256,6 +258,8 @@ static void remove_connection(snd_seq_t *seq, snd_seq_client_info_t *cinfo,
 		snd_seq_port_subscribe_t subs;
 		if (snd_seq_get_any_port_info(seq, query.addr.client, query.addr.port, &port) < 0)
 			continue;
+		if (!(port.capability & SND_SEQ_PORT_CAP_SUBS_WRITE))
+			continue;
 		if (port.capability & SND_SEQ_PORT_CAP_NO_EXPORT)
 			continue;
 		memset(&subs, 0, sizeof(subs));