Index: uspace/app/trace/ipcp.c
===================================================================
--- uspace/app/trace/ipcp.c	(revision 193d280c34f38846eccfa1ecce71975f9ad92398)
+++ uspace/app/trace/ipcp.c	(revision 2133e02ec289265efe06a41731344d5cd40b6a6e)
@@ -303,5 +303,5 @@
 	    (retval == 0)) {
 		/* Connected to a service (through NS) */
-		service = IPC_GET_ARG1(pcall->question);
+		service = IPC_GET_ARG2(pcall->question);
 		proto = proto_get_by_srv(service);
 		if (proto == NULL)