1 files changed, 1 insertions, 0 deletions
diff --git a/cache.h b/cache.h
index 52a45f9c9a..b8e3d9bfac 100644
--- a/cache.h
+++ b/cache.h
@@ -189,6 +189,7 @@ extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)
 extern char *sha1_file_name(const unsigned char *sha1);
 extern char *sha1_pack_name(const unsigned char *sha1);
 extern char *sha1_pack_index_name(const unsigned char *sha1);
+extern const unsigned char null_sha1[20];
 
 int git_mkstemp(char *path, size_t n, const char *template);