diff --git a/leaflet/__init__.py b/leaflet/__init__.py
index 10e4a8b..944735e 100644
--- a/leaflet/__init__.py
+++ b/leaflet/__init__.py
@@ -6,15 +6,15 @@
 from django.core.exceptions import ImproperlyConfigured
 from django.templatetags.static import static
 from django.utils.translation import gettext_lazy as _
+from django.utils.functional import lazy
 
-from .utils import memoized_lazy_function, ListWithLazyItems, ListWithLazyItemsRawIterator
+from .utils import ListWithLazyItems, ListWithLazyItemsRawIterator
 
 
 DEFAULT_TILES = [(_('OSM'), '//{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
                   '© <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors')]
 
 LEAFLET_CONFIG = getattr(settings, 'LEAFLET_CONFIG', {})
-
 app_settings = dict({
     'TILES': DEFAULT_TILES,
     'OVERLAYS': [],
@@ -168,7 +168,7 @@ def _normalize_plugins_config():
                     pass
                 else:
                     # pass relative URL through django.contrib.staticfiles
-                    urls[i] = memoized_lazy_function(static, url)  # lazy variant of `static(url)`
+                    urls[i] = lazy(static, str)(url)  # lazy variant of `static(url)`
 
             urls = ListWithLazyItems(urls)
             plugin_dict[resource_type] = urls
diff --git a/leaflet/utils.py b/leaflet/utils.py
index c694824..7f38b4d 100644
--- a/leaflet/utils.py
+++ b/leaflet/utils.py
@@ -3,30 +3,6 @@
 from django.utils.functional import Promise
 
 
-class memoized_lazy_function(Promise):
-    """
-    Represents a lazy value which is calculated by calling
-    func(*args, **kwargs) and then is memoized.
-
-    >>> f = memoized_lazy_function(lambda a: print('.') or a, 'hello')
-    >>> f()
-    .
-    'hello'
-    >>> f()
-    'hello'
-    """
-
-    def __init__(self, func, *args, **kwargs):
-        self._func = func
-        self._args = args
-        self._kwargs = kwargs
-
-    def __call__(self):
-        if not hasattr(self, '_result'):
-            self._result = self._func(*self._args, **self._kwargs)
-        return self._result
-
-
 class ListWithLazyItems(Sequence):
     """
     Mimics a lazy list.
@@ -45,13 +21,13 @@ def __init__(self, iterable=()):
 
     def __iter__(self):
         for item in self._list:
-            yield self._resolve_lazy_item(item)
+            yield item
 
     def __len__(self):
         return len(self._list)
 
     def __getitem__(self, index):
-        return self._resolve_lazy_item(self._list[index])
+        return self._list[index]
 
     def extend(self, iterable):
         if isinstance(iterable, ListWithLazyItems):
@@ -68,13 +44,6 @@ def __add__(self, iterable):
         lazy_list.extend(iterable)
         return lazy_list
 
-    @classmethod
-    def _resolve_lazy_item(cls, item):
-        if cls.is_lazy_item(item):
-            item = item()
-
-        return item
-
     @classmethod
     def is_lazy_item(cls, item):
         return isinstance(item, Promise)