diff --git a/openbsc/include/openbsc/gsm_subscriber.h b/openbsc/include/openbsc/gsm_subscriber.h
index c688c0195..b5e8fb64f 100644
--- a/openbsc/include/openbsc/gsm_subscriber.h
+++ b/openbsc/include/openbsc/gsm_subscriber.h
@@ -90,6 +90,8 @@ struct gsm_subscriber *subscr_active_by_imsi(struct gsm_network *net,
 
 char *subscr_name(struct gsm_subscriber *subscr);
 
+int subscr_purge_inactive(struct gsm_network *net);
+
 /* internal */
 struct gsm_subscriber *subscr_alloc(void);
 extern struct llist_head active_subscribers;
diff --git a/openbsc/src/gsm_subscriber_base.c b/openbsc/src/gsm_subscriber_base.c
index e3a04f343..8872a9ade 100644
--- a/openbsc/src/gsm_subscriber_base.c
+++ b/openbsc/src/gsm_subscriber_base.c
@@ -133,3 +133,18 @@ struct gsm_subscriber *subscr_active_by_imsi(struct gsm_network *net, const char
 
 	return NULL;
 }
+
+int subscr_purge_inactive(struct gsm_network *net)
+{
+	struct gsm_subscriber *subscr, *tmp;
+	int purged = 0;
+
+	llist_for_each_entry_safe(subscr, tmp, subscr_bsc_active_subscriber(), entry) {
+		if (subscr->net == net && subscr->use_count <= 0) {
+			subscr_free(subscr);
+			purged += 1;
+		}
+	}
+
+	return purged;
+}