diff --git a/src/wifi/helper/spectrum-wifi-helper.cc b/src/wifi/helper/spectrum-wifi-helper.cc
index 299757f60..fd16f5984 100644
--- a/src/wifi/helper/spectrum-wifi-helper.cc
+++ b/src/wifi/helper/spectrum-wifi-helper.cc
@@ -83,12 +83,12 @@ std::vector<Ptr<WifiPhy>>
 SpectrumWifiPhyHelper::Create (Ptr<Node> node, Ptr<WifiNetDevice> device) const
 {
   std::vector<Ptr<WifiPhy>> ret;
-  Ptr<InterferenceHelper> interference = m_interferenceHelper.Create<InterferenceHelper> ();
 
   for (std::size_t i = 0; i < m_phy.size (); i++)
     {
       Ptr<SpectrumWifiPhy> phy = m_phy.at (i).Create<SpectrumWifiPhy> ();
       phy->CreateWifiSpectrumPhyInterface (device);
+      auto interference = m_interferenceHelper.Create<InterferenceHelper> ();
       phy->SetInterferenceHelper (interference);
       Ptr<ErrorRateModel> error = m_errorRateModel.at (i).Create<ErrorRateModel> ();
       phy->SetErrorRateModel (error);