diff --git a/awx/api/serializers.py b/awx/api/serializers.py
index 215150365b..ba6791a41c 100644
--- a/awx/api/serializers.py
+++ b/awx/api/serializers.py
@@ -1212,7 +1212,7 @@ class GroupSerializer(BaseSerializerWithVariables):
 
 class GroupTreeSerializer(GroupSerializer):
 
-    children = serializers.SerializerMethodField('get_children')
+    children = serializers.SerializerMethodField()
 
     class Meta:
         model = Group