diff --git a/src/wifi/model/spectrum-wifi-phy.cc b/src/wifi/model/spectrum-wifi-phy.cc
index 8da9162a8..a7361a035 100644
--- a/src/wifi/model/spectrum-wifi-phy.cc
+++ b/src/wifi/model/spectrum-wifi-phy.cc
@@ -349,7 +349,7 @@ SpectrumWifiPhy::StartRx (Ptr<SpectrumSignalParameters> rxParams)
       NS_LOG_INFO ("Received signal too weak to process: " << WToDbm (totalRxPowerW) << " dBm");
       m_interference->Add (wifiRxParams->ppdu, wifiRxParams->ppdu->GetTxVector (), rxDuration,
                           rxPowerW);
-      SwitchMaybeToCcaBusy (GetMeasurementChannelWidth (wifiRxParams->ppdu));
+      SwitchMaybeToCcaBusy (GetMeasurementChannelWidth (nullptr));
       return;
     }