diff --git a/rest_framework/pagination.py b/rest_framework/pagination.py
index 95ba1448d..ca5c53c29 100644
--- a/rest_framework/pagination.py
+++ b/rest_framework/pagination.py
@@ -307,7 +307,7 @@ class PageNumberPagination(BasePagination):
                     name=self.page_size_query_param,
                     required=False,
                     location='query',
-                    #description=force_text(self.page_size_query_description)
+                    # description=force_text(self.page_size_query_description)
                 )
             )
         return fields
diff --git a/rest_framework/schemas.py b/rest_framework/schemas.py
index a875cc451..600698258 100644
--- a/rest_framework/schemas.py
+++ b/rest_framework/schemas.py
@@ -19,7 +19,6 @@ from rest_framework.request import clone_request
 from rest_framework.response import Response
 from rest_framework.settings import api_settings
 from rest_framework.utils import formatting
-from rest_framework.utils.field_mapping import ClassLookupDict
 from rest_framework.utils.model_meta import _get_pk
 from rest_framework.views import APIView
 
@@ -32,7 +31,7 @@ def field_to_schema(field):
     description = force_text(field.help_text) if field.help_text else ''
 
     if isinstance(field, serializers.ListSerializer):
-        child_schema = serializer_to_schema(field.child)
+        child_schema = field_to_schema(field.child)
         return coreschema.Array(
             items=child_schema,
             title=title,
@@ -41,7 +40,7 @@ def field_to_schema(field):
     elif isinstance(field, serializers.Serializer):
         return coreschema.Object(
             properties={
-                key: serializer_to_schema(value)
+                key: field_to_schema(value)
                 for key, value
                 in field.fields.items()
             },