--- a/virtual.h
+++ b/virtual.h
@@ -42,7 +42,7 @@
   };
 
 struct toc_entry {
-  u_char track_no;	/* track number */
+  unsigned char track_no;	/* track number */
   char is_data;		/* 1 = data track */
   char is_cdbackup;	/* was it created by CD-Backup? */
   int sec_start;	/* start sector */