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-rw-r--r--cache.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/cache.h b/cache.h
index 74307f1..6a7525a 100644
--- a/cache.h
+++ b/cache.h
@@ -167,7 +167,7 @@ extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, uns
extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size);
extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
-extern int check_sha1_signature(unsigned char *sha1, void *buf, unsigned long size, const char *type);
+extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
/* Read a tree into the cache */
extern int read_tree(void *buffer, unsigned long size, int stage);