diff --git a/src/wifi/model/spectrum-wifi-phy.cc b/src/wifi/model/spectrum-wifi-phy.cc
index 6bffabc88..dbb5903c8 100644
--- a/src/wifi/model/spectrum-wifi-phy.cc
+++ b/src/wifi/model/spectrum-wifi-phy.cc
@@ -111,6 +111,7 @@ SpectrumWifiPhy::DoDispose()
     m_spectrumPhyInterfaces.clear();
     m_currentSpectrumPhyInterface = nullptr;
     m_antenna = nullptr;
+    m_channelSwitchedCallback.Nullify();
     WifiPhy::DoDispose();
 }