Index: tlayer.c
===================================================================
--- tlayer.c	(revision 22477)
+++ tlayer.c	(revision 22478)
@@ -96,7 +96,7 @@
 			pcb_coord_t sx, sy, ex, ey, clr;
 
 			if (arc->Width != arc->Height)
-				pcb_io_incompat_save(pcb->Data, arc, "arc", "Elliptical arc", "Saving as circular arc instead - geometry will differ");
+				pcb_io_incompat_save(pcb->Data, (pcb_any_obj_t *)arc, "arc", "Elliptical arc", "Saving as circular arc instead - geometry will differ");
 
 			pcb_arc_get_end(arc, 0, &sx, &sy);
 			pcb_arc_get_end(arc, 1, &ex, &ey);