diff --git a/netbox/dcim/api/serializers.py b/netbox/dcim/api/serializers.py
index 3f6d55da7..c4aa838ea 100644
--- a/netbox/dcim/api/serializers.py
+++ b/netbox/dcim/api/serializers.py
@@ -880,12 +880,12 @@ class InterfaceSerializer(NetBoxModelSerializer, CabledObjectSerializer, Connect
     parent = NestedInterfaceSerializer(required=False, allow_null=True)
     bridge = NestedInterfaceSerializer(required=False, allow_null=True)
     lag = NestedInterfaceSerializer(required=False, allow_null=True)
-    mode = ChoiceField(choices=InterfaceModeChoices, required=False, allow_blank=True, allow_null=True)
+    mode = ChoiceField(choices=InterfaceModeChoices, required=False, allow_blank=True)
     duplex = ChoiceField(choices=InterfaceDuplexChoices, required=False, allow_blank=True, allow_null=True)
-    rf_role = ChoiceField(choices=WirelessRoleChoices, required=False, allow_blank=True, allow_null=True)
-    rf_channel = ChoiceField(choices=WirelessChannelChoices, required=False, allow_blank=True, allow_null=True)
-    poe_mode = ChoiceField(choices=InterfacePoEModeChoices, required=False, allow_blank=True, allow_null=True)
-    poe_type = ChoiceField(choices=InterfacePoETypeChoices, required=False, allow_blank=True, allow_null=True)
+    rf_role = ChoiceField(choices=WirelessRoleChoices, required=False, allow_blank=True)
+    rf_channel = ChoiceField(choices=WirelessChannelChoices, required=False, allow_blank=True)
+    poe_mode = ChoiceField(choices=InterfacePoEModeChoices, required=False, allow_blank=True)
+    poe_type = ChoiceField(choices=InterfacePoETypeChoices, required=False, allow_blank=True)
     untagged_vlan = NestedVLANSerializer(required=False, allow_null=True)
     tagged_vlans = SerializedPKRelatedField(
         queryset=VLAN.objects.all(),
@@ -907,9 +907,10 @@ class InterfaceSerializer(NetBoxModelSerializer, CabledObjectSerializer, Connect
     mac_address = serializers.CharField(
         required=False,
         default=None,
+        allow_blank=True,
         allow_null=True
     )
-    wwn = serializers.CharField(required=False, default=None)
+    wwn = serializers.CharField(required=False, default=None, allow_blank=True, allow_null=True)
 
     class Meta:
         model = Interface