1 files changed, 2 insertions, 2 deletions

diff --git a/cache.h b/cache.h
index ec85d93e0d..0da7070da4 100644
--- a/cache.h
+++ b/cache.h
@@ -359,8 +359,8 @@ extern void *map_sha1_file(const unsigned char *sha1, unsigned long *);
 extern int has_pack_file(const unsigned char *sha1);
 extern int has_pack_index(const unsigned char *sha1);
 
-extern signed char hexval_table[256];
-static inline unsigned int hexval(unsigned int c)
+extern const signed char hexval_table[256];
+static inline unsigned int hexval(unsigned char c)
 {
 	return hexval_table[c];
 }