Index: plug_import.c
===================================================================
--- plug_import.c	(revision 29511)
+++ plug_import.c	(revision 29512)
@@ -100,7 +100,7 @@
 }
 
 
-int pcb_import(pcb_hidlib_t *hidlib, char *filename, unsigned int aspect)
+int pcb_import(pcb_hidlib_t *hidlib, const char *filename, unsigned int aspect)
 {
 	pcb_plug_import_t *plug;
 	FILE *fp;
@@ -128,7 +128,7 @@
 	return plug->import(plug, aspect, &filename, 1);
 }
 
-int pcb_import_netlist(pcb_hidlib_t *hidlib, char *filename)
+int pcb_import_netlist(pcb_hidlib_t *hidlib, const char *filename)
 {
 	return pcb_import(hidlib, filename, IMPORT_ASPECT_NETLIST);
 }