Index: trunk/src/obj_pstk.c
===================================================================
--- trunk/src/obj_pstk.c	(revision 29018)
+++ trunk/src/obj_pstk.c	(revision 29019)
@@ -1237,7 +1237,7 @@
 	return ps->thermals.shape + lid;
 }
 
-void pcb_pstk_set_thermal(pcb_pstk_t *ps, unsigned long lid, unsigned char shape)
+void pcb_pstk_set_thermal(pcb_pstk_t *ps, unsigned long lid, unsigned char shape, int undoable)
 {
 	unsigned char *th = pcb_pstk_get_thermal(ps, lid, 1);
 	if (th != NULL)
Index: trunk/src/obj_pstk.h
===================================================================
--- trunk/src/obj_pstk.h	(revision 29018)
+++ trunk/src/obj_pstk.h	(revision 29019)
@@ -108,7 +108,7 @@
 unsigned int pcb_pstk_hash(const pcb_host_trans_t *tr, const pcb_pstk_t *p);
 
 
-void pcb_pstk_set_thermal(pcb_pstk_t *ps, unsigned long lid, unsigned char shape);
+void pcb_pstk_set_thermal(pcb_pstk_t *ps, unsigned long lid, unsigned char shape, int undoable);
 unsigned char *pcb_pstk_get_thermal(pcb_pstk_t *ps, unsigned long lid, pcb_bool_t alloc);
 
 pcb_pstk_t *pcb_pstk_by_id(pcb_data_t *base, long int ID);
Index: trunk/src/obj_pstk_op.c
===================================================================
--- trunk/src/obj_pstk_op.c	(revision 29018)
+++ trunk/src/obj_pstk_op.c	(revision 29019)
@@ -162,7 +162,7 @@
 	pcb_poly_restore_to_poly(pcb->Data, PCB_OBJ_PSTK, layer, ps);
 
 TODO("undo")
-	pcb_pstk_set_thermal(ps, ctx->chgtherm.lid, ctx->chgtherm.style);
+	pcb_pstk_set_thermal(ps, ctx->chgtherm.lid, ctx->chgtherm.style, 0);
 
 	pcb_undo_add_obj_to_clear_poly(PCB_OBJ_PSTK, ps, ps, ps, pcb_true);
 	pcb_poly_clear_from_poly(pcb->Data, PCB_OBJ_PSTK, layer, ps);