diff --git a/drivers/infiniband/hw/hfi1/rc.c b/drivers/infiniband/hw/hfi1/rc.c
index e1cf0c08ca6f..84c6a6ff4a67 100644
--- a/drivers/infiniband/hw/hfi1/rc.c
+++ b/drivers/infiniband/hw/hfi1/rc.c
@@ -815,7 +815,7 @@ static inline void hfi1_make_rc_ack_16B(struct rvt_qp *qp,
 	struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 	struct hfi1_16b_header *hdr = &opa_hdr->opah;
 	struct ib_other_headers *ohdr;
-	u32 bth0, bth1;
+	u32 bth0, bth1 = 0;
 	u16 len, pkey;
 	u8 becn = !!is_fecn;
 	u8 l4 = OPA_16B_L4_IB_LOCAL;