diff --git a/graphene/types/typemap.py b/graphene/types/typemap.py
index 360939f2..1547c893 100644
--- a/graphene/types/typemap.py
+++ b/graphene/types/typemap.py
@@ -118,6 +118,8 @@ class TypeMap(GraphQLTypeMap):
 
     def construct_objecttype(self, map, type):
         from .definitions import GrapheneObjectType
+        if type._meta.name in map:
+            return map
         map[type._meta.name] = GrapheneObjectType(
             graphene_type=type,
             name=type._meta.name,