diff --git a/polymorphic/query.py b/polymorphic/query.py
index 8cac5e0..6c87a93 100644
--- a/polymorphic/query.py
+++ b/polymorphic/query.py
@@ -20,40 +20,6 @@ from .query_translate import translate_polymorphic_field_path, translate_polymor
 Polymorphic_QuerySet_objects_per_request = 100
 
 
-def _polymorphic_iterator(queryset, base_iter):
-    """
-    Here we do the same as::
-
-        real_results = queryset._get_real_instances(list(base_iter))
-        for o in real_results: yield o
-
-    but it requests the objects in chunks from the database,
-    with Polymorphic_QuerySet_objects_per_request per chunk
-    """
-    while True:
-        base_result_objects = []
-        reached_end = False
-
-        # Make sure the base iterator is read in chunks instead of
-        # reading it completely, in case our caller read only a few objects.
-        for i in range(Polymorphic_QuerySet_objects_per_request):
-
-            try:
-                o = next(base_iter)
-                base_result_objects.append(o)
-            except StopIteration:
-                reached_end = True
-                break
-
-        real_results = queryset._get_real_instances(base_result_objects)
-
-        for o in real_results:
-            yield o
-
-        if reached_end:
-            return
-
-
 class PolymorphicModelIterable(ModelIterable):
     """
     ModelIterable for PolymorphicModel
@@ -66,7 +32,40 @@ class PolymorphicModelIterable(ModelIterable):
         base_iter = super(PolymorphicModelIterable, self).__iter__()
         if self.queryset.polymorphic_disabled:
             return base_iter
-        return _polymorphic_iterator(self.queryset, base_iter)
+        return self._polymorphic_iterator(base_iter)
+
+    def _polymorphic_iterator(self, base_iter):
+        """
+        Here we do the same as::
+
+            real_results = queryset._get_real_instances(list(base_iter))
+            for o in real_results: yield o
+
+        but it requests the objects in chunks from the database,
+        with Polymorphic_QuerySet_objects_per_request per chunk
+        """
+        while True:
+            base_result_objects = []
+            reached_end = False
+
+            # Make sure the base iterator is read in chunks instead of
+            # reading it completely, in case our caller read only a few objects.
+            for i in range(Polymorphic_QuerySet_objects_per_request):
+
+                try:
+                    o = next(base_iter)
+                    base_result_objects.append(o)
+                except StopIteration:
+                    reached_end = True
+                    break
+
+            real_results = self.queryset._get_real_instances(base_result_objects)
+
+            for o in real_results:
+                yield o
+
+            if reached_end:
+                return
 
 
 def transmogrify(cls, obj):