diff --git a/graphene/types/schema.py b/graphene/types/schema.py
index 6a1af687..99532354 100644
--- a/graphene/types/schema.py
+++ b/graphene/types/schema.py
@@ -26,7 +26,6 @@ from graphql import (
     GraphQLObjectType,
     GraphQLSchema,
     GraphQLString,
-    Undefined,
 )
 from graphql.execution import ExecutionContext
 from graphql.execution.values import get_argument_values
diff --git a/graphene/types/tests/test_type_map.py b/graphene/types/tests/test_type_map.py
index 334eb241..79572916 100644
--- a/graphene/types/tests/test_type_map.py
+++ b/graphene/types/tests/test_type_map.py
@@ -6,6 +6,7 @@ from graphql.type import (
     GraphQLInputField,
     GraphQLInputObjectType,
     GraphQLInterfaceType,
+    GraphQLNonNull,
     GraphQLObjectType,
     GraphQLString,
 )
@@ -94,6 +95,23 @@ def test_objecttype():
     }
 
 
+def test_required_argument_with_default_value():
+    class MyObjectType(ObjectType):
+        foo = String(
+            bar=String(required=True, default_value="x")
+        )
+
+    type_map = create_type_map([MyObjectType])
+
+    graphql_type = type_map["MyObjectType"]
+    foo_field = graphql_type.fields["foo"]
+
+    bar_argument = foo_field.args["bar"]
+    assert bar_argument.default_value == "x"
+    assert isinstance(bar_argument.type, GraphQLNonNull)
+    assert bar_argument.type.of_type == GraphQLString
+
+
 def test_dynamic_objecttype():
     class MyObjectType(ObjectType):
         """Description"""