diff --git a/lib/Doctrine/ORM/Proxy/ProxyException.php b/lib/Doctrine/ORM/Proxy/ProxyException.php
index 892dbebbb..29462780d 100644
--- a/lib/Doctrine/ORM/Proxy/ProxyException.php
+++ b/lib/Doctrine/ORM/Proxy/ProxyException.php
@@ -36,6 +36,10 @@ class ProxyException extends \Doctrine\ORM\ORMException {
         return new self("You must configure a proxy directory. See docs for details");
     }
 
+    public static function proxyDirectoryNotWritable() {
+        return new self("Your proxy directory must be writable.");
+    }
+
     public static function proxyNamespaceRequired() {
         return new self("You must configure a proxy namespace. See docs for details");
     }
diff --git a/lib/Doctrine/ORM/Proxy/ProxyFactory.php b/lib/Doctrine/ORM/Proxy/ProxyFactory.php
index 6ab28be3a..9436bcb71 100644
--- a/lib/Doctrine/ORM/Proxy/ProxyFactory.php
+++ b/lib/Doctrine/ORM/Proxy/ProxyFactory.php
@@ -153,8 +153,8 @@ class ProxyFactory
         $file = str_replace($placeholders, $replacements, $file);
 
         $parentDirectory = dirname($fileName);
-        if (! is_dir($parentDirectory)) {
-            mkdir($parentDirectory, 0, true);
+        if (! is_dir($parentDirectory) && ! mkdir($parentDirectory, 0775, true)) {
+            throw ProxyException::proxyDirectoryNotWritable();
         }
 
         file_put_contents($fileName, $file, LOCK_EX);