1 files changed, 1 insertions, 1 deletions

diff --git a/blob.h b/blob.h
index 8004c835e7..ea5d9e9f8b 100644
--- a/blob.h
+++ b/blob.h
@@ -9,7 +9,7 @@ struct blob {
 	struct object object;
 };
 
-struct blob *lookup_blob(unsigned char *sha1);
+struct blob *lookup_blob(const unsigned char *sha1);
 
 int parse_blob_buffer(struct blob *item, void *buffer, unsigned long size);