diff --git a/drivers/infiniband/hw/hfi1/qp.c b/drivers/infiniband/hw/hfi1/qp.c
index 0c2ae9f7b3e8..2f3d9ce077d3 100644
--- a/drivers/infiniband/hw/hfi1/qp.c
+++ b/drivers/infiniband/hw/hfi1/qp.c
@@ -195,7 +195,7 @@ static inline int verbs_mtu_enum_to_int(struct ib_device *dev, enum ib_mtu mtu)
 {
 	/* Constraining 10KB packets to 8KB packets */
 	if (mtu == (enum ib_mtu)OPA_MTU_10240)
-		mtu = OPA_MTU_8192;
+		mtu = (enum ib_mtu)OPA_MTU_8192;
 	return opa_mtu_enum_to_int((enum opa_mtu)mtu);
 }