diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c
index 5e2765aadce174e9b7cffd479667a2c48bcf500f..dc6e2be265b793cf0f51b8138cf29ad0f45cb540 100644
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -2217,7 +2217,7 @@ struct btree_insert_op {
 	struct bkey	*replace_key;
 };
 
-int btree_insert_fn(struct btree_op *b_op, struct btree *b)
+static int btree_insert_fn(struct btree_op *b_op, struct btree *b)
 {
 	struct btree_insert_op *op = container_of(b_op,
 					struct btree_insert_op, op);