1 files changed, 1 insertions, 1 deletions
diff --git a/blob.c b/blob.c
index c800cd3905..ea52ad5c9d 100644
--- a/blob.c
+++ b/blob.c
@@ -4,7 +4,7 @@
 
 const char *blob_type = "blob";
 
-struct blob *lookup_blob(unsigned char *sha1)
+struct blob *lookup_blob(const unsigned char *sha1)
 {
 	struct object *obj = lookup_object(sha1);
 	if (!obj) {