Index: layer.c
===================================================================
--- layer.c	(revision 21482)
+++ layer.c	(revision 21483)
@@ -655,12 +655,12 @@
 	}
 
 	if (new_index == -1 && is_last_top_copper_layer(pcb, old_index)) {
-		pcb_gui->confirm_dialog("You can't delete the last top-side layer\n", "Ok", NULL);
+		pcb_hid_message_box("warning", "Layer delete", "You can't delete the last top-side layer\n", "cancel", 0, NULL);
 		return 1;
 	}
 
 	if (new_index == -1 && is_last_bottom_copper_layer(pcb, old_index)) {
-		pcb_gui->confirm_dialog("You can't delete the last bottom-side layer\n", "Ok", NULL);
+		pcb_hid_message_box("warning", "Layer delete", "You can't delete the last bottom-side layer\n", "cancel", 0, NULL);
 		return 1;
 	}