Index: layer_grp.c
===================================================================
--- layer_grp.c	(revision 26775)
+++ layer_grp.c	(revision 26776)
@@ -687,7 +687,7 @@
 		*xform = NULL;
 
 	if (pcb_gui->set_layer_group != NULL)
-		return pcb_gui->set_layer_group(&PCB->hidlib, gid, grp->purpose, grp->purpi, grp->lid[0], grp->ltype, is_empty, xform);
+		return pcb_gui->set_layer_group(pcb_gui, &PCB->hidlib, gid, grp->purpose, grp->purpi, grp->lid[0], grp->ltype, is_empty, xform);
 
 	/* if the GUI doesn't have a set_layer, assume it wants to draw all layers */
 	return 1;