diff --git a/bulk-checkin.c b/bulk-checkin.c
index 2753d5bbe4..c1080b488f 100644
--- a/bulk-checkin.c
+++ b/bulk-checkin.c
@@ -271,7 +271,7 @@ static int deflate_blob_to_pack(struct bulk_checkin_packfile *state,
 					  OBJ_BLOB, size);
 	the_hash_algo->init_fn(&ctx);
 	the_hash_algo->update_fn(&ctx, obuf, header_len);
-	the_hash_algo->init_fn(&checkpoint.ctx);
+	the_hash_algo->unsafe_init_fn(&checkpoint.ctx);
 
 	/* Note: idx is non-NULL when we are writing */
 	if ((flags & HASH_WRITE_OBJECT) != 0)