Index: read.c
===================================================================
--- read.c	(revision 28815)
+++ read.c	(revision 28816)
@@ -624,7 +624,7 @@
 /* Return 1 on success, 0 on fail
    Return the side of "side", and set lyname to lyname_top or lyname_bottom depending on side
    For a subcircuit, the side is given by MNT_SIDE argument */
-static int parse_side(node_t *n, pcb_layer_type_t subc_side, pcb_layer_type_t *side, char *lyname, char *lyname_top, char *lyname_bottom)
+static int parse_side(node_t *n, pcb_layer_type_t subc_side, pcb_layer_type_t *side, const char *lyname, const char *lyname_top, const char *lyname_bottom)
 {
 	node_t *tmp;