Index: uspace/lib/c/generic/async/ports.c
===================================================================
--- uspace/lib/c/generic/async/ports.c	(revision ca48672c28630656df768752aa9bc313ce9ad11c)
+++ uspace/lib/c/generic/async/ports.c	(revision 113fb4f7d41823fcc1ee75be3d89b3ccb0cb247e)
@@ -208,5 +208,5 @@
 {
 	/* Destroy interfaces */
-	hash_table_apply(&port->interface_hash_table, destroy_if, NULL);
+	hash_table_apply(&port->interface_hash_table, destroy_if, port);
 
 	hash_table_destroy(&port->interface_hash_table);