Index: thermal.c
===================================================================
--- thermal.c	(revision 12596)
+++ thermal.c	(revision 12597)
@@ -614,7 +614,7 @@
 		case PCB_OBJ_LINE:
 			return pcb_thermal_area_line(pcb, (pcb_line_t *)obj, lid);
 
-		case PCB_OBJ_POLYGON:
+		case PCB_OBJ_POLY:
 			return pcb_thermal_area_poly(pcb, (pcb_poly_t *)obj, lid);
 
 		case PCB_OBJ_PSTK: