Index: trunk/src/layer_vis.c
===================================================================
--- trunk/src/layer_vis.c	(revision 8581)
+++ trunk/src/layer_vis.c	(revision 8582)
@@ -76,7 +76,7 @@
  * changes the visibility of all layers in a group
  * returns the number of changed layers
  */
-int pcb_layervis_change_group_vis(int Layer, pcb_bool On, pcb_bool ChangeStackOrder)
+int pcb_layervis_change_group_vis(pcb_layer_id_t Layer, pcb_bool On, pcb_bool ChangeStackOrder)
 {
 	unsigned long flg;
 	pcb_layergrp_id_t group;
Index: trunk/src/layer_vis.h
===================================================================
--- trunk/src/layer_vis.h	(revision 8581)
+++ trunk/src/layer_vis.h	(revision 8582)
@@ -34,7 +34,7 @@
 
 /* changes the visibility of all layers in a group; returns the number of
    changed layers */
-int pcb_layervis_change_group_vis(int Layer, pcb_bool On, pcb_bool ChangeStackOrder);
+int pcb_layervis_change_group_vis(pcb_layer_id_t Layer, pcb_bool On, pcb_bool ChangeStackOrder);
 
 /* resets the layer visibility stack setting */
 void pcb_layervis_reset_stack(void);