diff --git a/src/wifi/model/wifi-tx-vector.cc b/src/wifi/model/wifi-tx-vector.cc
index 2253b72f1..57c85cd42 100644
--- a/src/wifi/model/wifi-tx-vector.cc
+++ b/src/wifi/model/wifi-tx-vector.cc
@@ -75,6 +75,7 @@ WifiTxVector::WifiTxVector(WifiMode mode,
       m_triggerResponding(triggerResponding),
       m_modeInitialized(true),
       m_inactiveSubchannels(),
+      m_sigBMcs(EhtPhy::GetVhtMcs(0)),
       m_ruAllocation(),
       m_center26ToneRuIndication(std::nullopt),
       m_ehtPpduType(1) // SU transmission by default