diff --git a/builtin/fast-import.c b/builtin/fast-import.c
index 1e7ab67f6e..48f8d015a0 100644
--- a/builtin/fast-import.c
+++ b/builtin/fast-import.c
@@ -1102,7 +1102,7 @@ static void stream_blob(uintmax_t len, struct object_id *oidout, uintmax_t mark)
 		|| (pack_size + PACK_SIZE_THRESHOLD + len) < pack_size)
 		cycle_packfile();
 
-	the_hash_algo->init_fn(&checkpoint.ctx);
+	the_hash_algo->unsafe_init_fn(&checkpoint.ctx);
 	hashfile_checkpoint(pack_file, &checkpoint);
 	offset = checkpoint.offset;