Index: src/obj_line.c
===================================================================
--- src/obj_line.c	(revision 17038)
+++ src/obj_line.c	(revision 17039)
@@ -97,7 +97,7 @@
 	struct line_info *i = (struct line_info *) cl;
 
 	/* do not merge to subc parts or terminals */
-	if ((pcb_obj_parent_subc(line) != NULL) || (line->term != NULL))
+	if ((pcb_obj_parent_subc((pcb_any_obj_t *)line) != NULL) || (line->term != NULL))
 		return PCB_R_DIR_NOT_FOUND;
 
 	if (line->Point1.X == i->X1 && line->Point2.X == i->X2 && line->Point1.Y == i->Y1 && line->Point2.Y == i->Y2) {