Index: uspace/srv/net/il/ip/ip_messages.h
===================================================================
--- uspace/srv/net/il/ip/ip_messages.h	(revision e417b961e64a18ae1b50d3898c8108c524af1400)
+++ uspace/srv/net/il/ip/ip_messages.h	(revision 1faa99588d67fde7acd1feca06054788f42aff4e)
@@ -85,5 +85,5 @@
  */
 #define IP_SET_HEADERLEN(answer, value) \
-	{ipcarg_t argument = (value); IPC_SET_ARG2(*answer, argument);}
+	{ipcarg_t argument = (ipcarg_t) (value); IPC_SET_ARG2(*answer, argument);}
 
 /** Returns the network mask message parameter.