diff --git a/openbsc/src/gsm_subscriber_base.c b/openbsc/src/gsm_subscriber_base.c
index e3a04f3..8872a9a 100644
--- a/openbsc/src/gsm_subscriber_base.c
+++ b/openbsc/src/gsm_subscriber_base.c
@@ -133,3 +133,18 @@
 
 	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;
+}