Index: uspace/srv/net/il/arp/arp_messages.h
===================================================================
--- uspace/srv/net/il/arp/arp_messages.h	(revision a64c64d04f3d981abf5d095ae65ed7ed4b40a244)
+++ uspace/srv/net/il/arp/arp_messages.h	(revision e417b961e64a18ae1b50d3898c8108c524af1400)
@@ -75,5 +75,6 @@
  *  @param[in] call The message call structure.
  */
-#define ARP_GET_NETIF(call)		(services_t) IPC_GET_ARG2(*call)
+#define ARP_GET_NETIF(call) \
+	({services_t service = (services_t) IPC_GET_ARG2(*call); service;})
 
 /*@}*/