Index: uspace/lib/graph/graph.c
===================================================================
--- uspace/lib/graph/graph.c	(revision df2e621c24f26d06158dbd519ce22ee6c3cd0775)
+++ uspace/lib/graph/graph.c	(revision 1d03e8624d55cc2446a937a2e7b82e7617866732)
@@ -606,6 +606,6 @@
 {
 	/* Find the visualizer or renderer with the given service ID. */
-	visualizer_t *vs = graph_get_visualizer(IPC_GET_ARG1(*icall));
-	renderer_t *rnd = graph_get_renderer(IPC_GET_ARG1(*icall));
+	visualizer_t *vs = graph_get_visualizer(IPC_GET_ARG2(*icall));
+	renderer_t *rnd = graph_get_renderer(IPC_GET_ARG2(*icall));
 	
 	if (vs != NULL)