diff --git a/awx/api/serializers.py b/awx/api/serializers.py
index bba331fa23..99bdf339ea 100644
--- a/awx/api/serializers.py
+++ b/awx/api/serializers.py
@@ -4587,8 +4587,8 @@ class InstanceGroupSerializer(BaseSerializer):
     percent_capacity_remaining = serializers.SerializerMethodField()
     jobs_running = serializers.SerializerMethodField()
     instances = serializers.SerializerMethodField()
-    policy_instance_percentage = serializers.IntegerField(min_value=0, max_value=100)
-    policy_instance_minimum = serializers.IntegerField(min_value=0)
+    policy_instance_percentage = serializers.IntegerField(min_value=0, max_value=100, required=False, initial=0)
+    policy_instance_minimum = serializers.IntegerField(min_value=0, required=False, initial=0)
 
     class Meta:
         model = InstanceGroup