diff --git a/lib/Twig/Environment.php b/lib/Twig/Environment.php
index 49816ed9d..4c4091614 100644
--- a/lib/Twig/Environment.php
+++ b/lib/Twig/Environment.php
@@ -263,6 +263,10 @@ class Twig_Environment
         } elseif (false === $cache) {
             $this->originalCache = $cache;
             $this->cache = new Twig_Cache_Null();
+        } elseif (null === $cache) {
+            @trigger_error('Using "null" as the cache strategy is deprecated and will be removed in Twig 2.0.', E_USER_DEPRECATED);
+            $this->originalCache = false;
+            $this->cache = new Twig_Cache_Null();
         } elseif ($cache instanceof Twig_CacheInterface) {
             $this->originalCache = $this->cache = $cache;
         } else {