diff --git a/programmer.h b/programmer.h
index d6b9cd6..6f69db1 100644
--- a/programmer.h
+++ b/programmer.h
@@ -264,7 +264,7 @@
 void cleanup_cpu_msr(void);
 
 /* cbtable.c */
-void lb_vendor_dev_from_string(char *boardstring);
+void lb_vendor_dev_from_string(const char *boardstring);
 int coreboot_init(void);
 extern char *lb_part, *lb_vendor;
 extern int partvendor_from_cbtable;