Index: src/plug_io.c
===================================================================
--- src/plug_io.c	(revision 8094)
+++ src/plug_io.c	(revision 8095)
@@ -196,7 +196,7 @@
 	return res;
 }
 
-int pcb_parse_font(pcb_font_t *Ptr, char *Filename)
+int pcb_parse_font(pcb_font_t *Ptr, const char *Filename)
 {
 	int res = -1;
 	PCB_HOOK_CALL(pcb_plug_io_t, pcb_plug_io_chain, parse_font, res, == 0, (self, Ptr, Filename));
Index: src/plug_io.h
===================================================================
--- src/plug_io.h	(revision 8094)
+++ src/plug_io.h	(revision 8095)
@@ -107,7 +107,7 @@
 /********** hook wrappers **********/
 int pcb_parse_pcb(pcb_board_t *Ptr, const char *Filename, const char *fmt, int load_settings, int ignore_missing);
 int pcb_parse_element(pcb_data_t *Ptr, const char *name);
-int pcb_parse_font(pcb_font_t *Ptr, char *Filename);
+int pcb_parse_font(pcb_font_t *Ptr, const char *Filename);
 int pcb_write_buffer(FILE *f, pcb_buffer_t *buff, const char *fmt);
 int pcb_write_element_data(FILE *f, pcb_data_t *e, const char *fmt);
 int pcb_write_font(pcb_font_t *Ptr, char *Filename, const char *fmt);