diff --git a/openbsc/include/openbsc/gtphub.h b/openbsc/include/openbsc/gtphub.h
index cf1bfe8..1ddae76 100644
--- a/openbsc/include/openbsc/gtphub.h
+++ b/openbsc/include/openbsc/gtphub.h
@@ -185,7 +185,7 @@
 
 /* Add a new mapping, or restart the expiry timeout for an already listed
  * mapping. */
-void expiry_add(struct expiry *exq, struct expiring_item *mapping, time_t now);
+void expiry_add(struct expiry *exq, struct expiring_item *item, time_t now);
 
 /* Initialize to all-empty; must be called before using the item in any way. */
 void expiring_item_init(struct expiring_item *item);