diff --git a/rest_framework/generics.py b/rest_framework/generics.py
index 99e9782e2..5a05ef3ef 100644
--- a/rest_framework/generics.py
+++ b/rest_framework/generics.py
@@ -92,13 +92,14 @@ class GenericAPIView(views.APIView):
         """
         Return a serializer instance to use with paginated data.
         """
-        class SerializerClass(self.pagination_serializer_class):
-            class Meta:
-                object_serializer_class = self.get_serializer_class()
+        if self.pagination_serializer_class:
+            class SerializerClass(self.pagination_serializer_class):
+                class Meta:
+                    object_serializer_class = self.get_serializer_class()
 
-        pagination_serializer_class = SerializerClass
-        context = self.get_serializer_context()
-        return pagination_serializer_class(instance=page, context=context)
+            pagination_serializer_class = SerializerClass
+            context = self.get_serializer_context()
+            return pagination_serializer_class(instance=page, context=context)
 
     def paginate_queryset(self, queryset, page_size=None):
         """
diff --git a/rest_framework/mixins.py b/rest_framework/mixins.py
index f11def6d4..2f419d1e3 100644
--- a/rest_framework/mixins.py
+++ b/rest_framework/mixins.py
@@ -90,8 +90,11 @@ class ListModelMixin(object):
         page = self.paginate_queryset(self.object_list)
         if page is not None:
             serializer = self.get_pagination_serializer(page)
-        else:
-            serializer = self.get_serializer(self.object_list, many=True)
+
+            if serializer:
+                return Response(serializer.data)
+
+        serializer = self.get_serializer(self.object_list, many=True)
 
         return Response(serializer.data)