diff --git a/drivers/infiniband/hw/mlx4/mr.c b/drivers/infiniband/hw/mlx4/mr.c
index a4cdb465cd1d6c2b49ada47998fd0f59d5624a30..87f5c5a87b98fa499e55115db660c8e72dd56fd8 100644
--- a/drivers/infiniband/hw/mlx4/mr.c
+++ b/drivers/infiniband/hw/mlx4/mr.c
@@ -204,6 +204,8 @@ struct ib_mr *mlx4_ib_alloc_fast_reg_mr(struct ib_pd *pd,
 	if (err)
 		goto err_mr;
 
+	mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
+
 	return &mr->ibmr;
 
 err_mr: