diff --git a/src/ib.cc b/src/ib.cc
index 7e77b235..1e3e0af6 100644
--- a/src/ib.cc
+++ b/src/ib.cc
@@ -128,6 +128,7 @@ IbQp::IbQp(void* ctx, void* pd, int port)
     throw std::runtime_error(err.str());
   }
   this->qp = _qp;
+  this->wrn = 0;
   MSCCLPPTHROW(mscclppCalloc(reinterpret_cast<struct ibv_send_wr**>(&this->wrs), MSCCLPP_IB_MAX_SENDS));
   MSCCLPPTHROW(mscclppCalloc(reinterpret_cast<struct ibv_sge**>(&this->sges), MSCCLPP_IB_MAX_SENDS));
   MSCCLPPTHROW(mscclppCalloc(reinterpret_cast<struct ibv_wc**>(&this->wcs), MSCCLPP_IB_CQ_POLL_NUM));