diff --git a/netbox/dcim/models/device_components.py b/netbox/dcim/models/device_components.py
index 5a087b495..951230bff 100644
--- a/netbox/dcim/models/device_components.py
+++ b/netbox/dcim/models/device_components.py
@@ -913,7 +913,7 @@ class Interface(ModularComponentModel, BaseInterface, CabledObjectModel, PathEnd
             self.rf_channel_width = get_channel_attr(self.rf_channel, 'width')
 
         # Clear any tagged vlans set when mode is tagged-all
-        if self.mode == InterfaceModeChoices.MODE_TAGGED_ALL and self.tagged_vlans:
+        if self.mode == InterfaceModeChoices.MODE_TAGGED_ALL and self.tagged_vlans.count():
             self.tagged_vlans.set([])
 
         super().save(*args, **kwargs)