1 files changed, 1 insertions, 1 deletions
diff --git a/cache.h b/cache.h
index 1b50a742a..384b26022 100644
--- a/cache.h
+++ b/cache.h
@@ -283,7 +283,7 @@ char *enter_repo(char *path, int strict);
 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 extern int sha1_object_info(const unsigned char *, unsigned long *);
 extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
-extern int hash_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *sha1);
+extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);