diff --git a/src/wifi/model/wifi-mac-header.cc b/src/wifi/model/wifi-mac-header.cc
index 22512e301..925523361 100644
--- a/src/wifi/model/wifi-mac-header.cc
+++ b/src/wifi/model/wifi-mac-header.cc
@@ -832,29 +832,25 @@ WifiMacHeader::IsPowerManagement() const
 bool
 WifiMacHeader::IsQosBlockAck() const
 {
-    NS_ASSERT(IsQosData());
-    return (m_qosAckPolicy == 3);
+    return (IsQosData() && m_qosAckPolicy == 3);
 }
 
 bool
 WifiMacHeader::IsQosNoAck() const
 {
-    NS_ASSERT(IsQosData());
-    return (m_qosAckPolicy == 1);
+    return (IsQosData() && m_qosAckPolicy == 1);
 }
 
 bool
 WifiMacHeader::IsQosAck() const
 {
-    NS_ASSERT(IsQosData());
-    return (m_qosAckPolicy == 0);
+    return (IsQosData() && m_qosAckPolicy == 0);
 }
 
 bool
 WifiMacHeader::IsQosEosp() const
 {
-    NS_ASSERT(IsQosData());
-    return (m_qosEosp == 1);
+    return (IsQosData() && m_qosEosp == 1);
 }
 
 WifiMacHeader::QosAckPolicy
@@ -886,8 +882,7 @@ WifiMacHeader::GetQosAckPolicy() const
 bool
 WifiMacHeader::IsQosAmsdu() const
 {
-    NS_ASSERT(IsQosData());
-    return (m_amsduPresent == 1);
+    return (IsQosData() && m_amsduPresent == 1);
 }
 
 uint8_t
diff --git a/src/wifi/model/wifi-mac-header.h b/src/wifi/model/wifi-mac-header.h
index 55dd4c9c0..6252444fe 100644
--- a/src/wifi/model/wifi-mac-header.h
+++ b/src/wifi/model/wifi-mac-header.h
@@ -555,33 +555,33 @@ class WifiMacHeader : public Header
      */
     bool IsMoreFragments() const;
     /**
-     * Return if the QoS Ack policy is Block Ack.
+     * Return if IsQosData() is true and the QoS Ack policy is Block Ack.
      *
-     * @return true if the QoS Ack policy is Block Ack, false otherwise
+     * @return true if IsQosData() and the QoS Ack policy is Block Ack, false otherwise
      */
     bool IsQosBlockAck() const;
     /**
-     * Return if the QoS Ack policy is No Ack.
+     * Return if IsQosData() is true and the QoS Ack policy is No Ack.
      *
-     * @return true if the QoS Ack policy is No Ack, false otherwise
+     * @return true if IsQosData() and the QoS Ack policy is No Ack, false otherwise
      */
     bool IsQosNoAck() const;
     /**
-     * Return if the QoS Ack policy is Normal Ack.
+     * Return if IsQosData() is true and the QoS Ack policy is Normal Ack.
      *
-     * @return true if the QoS Ack policy is No Ack, false otherwise
+     * @return true if IsQosData() and the QoS Ack policy is No Ack, false otherwise
      */
     bool IsQosAck() const;
     /**
-     * Return if the end of service period (EOSP) is set.
+     * Return if IsQosData() is true and the end of service period (EOSP) is set.
      *
-     * @return true if the end of service period (EOSP) is set, false otherwise
+     * @return true if IsQosData() and the end of service period (EOSP) is set, false otherwise
      */
     bool IsQosEosp() const;
     /**
-     * Check if the A-MSDU present bit is set in the QoS control field.
+     * Check if IsQosData() is true and the A-MSDU present bit is set in the QoS control field.
      *
-     * @return true if the A-MSDU present bit is set,
+     * @return true if IsQosData() and the A-MSDU present bit is set,
      *         false otherwise
      */
     bool IsQosAmsdu() const;