diff --git a/phpBB/composer.json b/phpBB/composer.json
index 7145265e55..e91430023d 100644
--- a/phpBB/composer.json
+++ b/phpBB/composer.json
@@ -31,7 +31,7 @@
 		"guzzlehttp/guzzle": "~5.3",
 		"lusitanian/oauth": "^0.8.1",
 		"marc1706/fast-image-size": "^1.1",
-		"paragonie/random_compat": "^2.0",
+		"paragonie/random_compat": "^1.4",
 		"patchwork/utf8": "^1.1",
 		"s9e/text-formatter": "~0.8.0",
 		"symfony/config": "^2.8",
diff --git a/phpBB/composer.lock b/phpBB/composer.lock
index ec69331b13..e550572fb3 100644
--- a/phpBB/composer.lock
+++ b/phpBB/composer.lock
@@ -4,8 +4,8 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "9e6c5df052c3e795ad5985862bbb5797",
-    "content-hash": "47456b70d82a0df10e5faa0a3dc1c2ae",
+    "hash": "067b099cc97334a6a08a77e5648aa260",
+    "content-hash": "90198ca524b93a7e915aa6916b2f55af",
     "packages": [
         {
             "name": "bantu/ini-get-wrapper",
@@ -460,16 +460,16 @@
         },
         {
             "name": "paragonie/random_compat",
-            "version": "v2.0.4",
+            "version": "v1.4.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/paragonie/random_compat.git",
-                "reference": "a9b97968bcde1c4de2a5ec6cbd06a0f6c919b46e"
+                "reference": "c7e26a21ba357863de030f0b9e701c7d04593774"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/paragonie/random_compat/zipball/a9b97968bcde1c4de2a5ec6cbd06a0f6c919b46e",
-                "reference": "a9b97968bcde1c4de2a5ec6cbd06a0f6c919b46e",
+                "url": "https://api.github.com/repos/paragonie/random_compat/zipball/c7e26a21ba357863de030f0b9e701c7d04593774",
+                "reference": "c7e26a21ba357863de030f0b9e701c7d04593774",
                 "shasum": ""
             },
             "require": {
@@ -504,7 +504,7 @@
                 "pseudorandom",
                 "random"
             ],
-            "time": "2016-11-07 23:38:38"
+            "time": "2016-03-18 20:34:03"
         },
         {
             "name": "patchwork/utf8",
diff --git a/phpBB/phpbb/di/container_builder.php b/phpBB/phpbb/di/container_builder.php
index b6854673c2..4d5f189f12 100644
--- a/phpBB/phpbb/di/container_builder.php
+++ b/phpBB/phpbb/di/container_builder.php
@@ -14,7 +14,6 @@
 namespace phpbb\di;
 
 use phpbb\filesystem\filesystem;
-use Symfony\Bridge\ProxyManager\LazyProxy\Instantiator\RuntimeInstantiator;
 use Symfony\Bridge\ProxyManager\LazyProxy\PhpDumper\ProxyDumper;
 use Symfony\Component\Config\ConfigCache;
 use Symfony\Component\Config\FileLocator;
@@ -488,7 +487,7 @@ class container_builder
 	protected function create_container(array $extensions)
 	{
 		$container = new ContainerBuilder(new ParameterBag($this->get_core_parameters()));
-		$container->setProxyInstantiator(new RuntimeInstantiator());
+		$container->setProxyInstantiator(new proxy_instantiator($this->get_cache_dir()));
 
 		$extensions_alias = array();
 
diff --git a/phpBB/phpbb/di/proxy_instantiator.php b/phpBB/phpbb/di/proxy_instantiator.php
new file mode 100644
index 0000000000..a388e82c0e
--- /dev/null
+++ b/phpBB/phpbb/di/proxy_instantiator.php
@@ -0,0 +1,77 @@
+<?php
+/**
+ *
+ * This file is part of the phpBB Forum Software package.
+ *
+ * @copyright (c) phpBB Limited <https://www.phpbb.com>
+ * @license GNU General Public License, version 2 (GPL-2.0)
+ *
+ * For full copyright and license information, please see
+ * the docs/CREDITS.txt file.
+ *
+ */
+
+namespace phpbb\di;
+
+use bantu\IniGetWrapper\IniGetWrapper;
+use phpbb\filesystem\filesystem;
+use ProxyManager\Configuration;
+use ProxyManager\Factory\LazyLoadingValueHolderFactory;
+use ProxyManager\GeneratorStrategy\EvaluatingGeneratorStrategy;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\LazyProxy\Instantiator\InstantiatorInterface;
+
+/**
+ * Runtime lazy loading proxy generator extended for allowing use while using
+ * open_basedir restrictions
+ *
+ * Original author: Marco Pivetta <ocramius@gmail.com>
+ */
+class proxy_instantiator implements InstantiatorInterface
+{
+	/**
+	 * @var LazyLoadingValueHolderFactory
+	 */
+	private $factory;
+
+	/**
+	 * proxy_instantiator constructor
+	 * @param string $cache_dir Cache dir for fall back when using open_basedir
+	 */
+	public function __construct($cache_dir)
+	{
+		$config = new Configuration();
+
+		// Prevent trying to write to system temp dir in case of open_basedir
+		// restrictions being in effect
+		$ini_wrapper = new IniGetWrapper();
+		$filesystem = new filesystem();
+		$tmp_dir = (function_exists('sys_get_temp_dir')) ? sys_get_temp_dir() : '';
+		if (empty($tmp_dir) || $ini_wrapper->getString('open_basedir') &&
+			(!$filesystem->exists($tmp_dir) || !$filesystem->is_writable($tmp_dir)))
+		{
+			$config->setProxiesTargetDir($cache_dir);
+		}
+		$config->setGeneratorStrategy(new EvaluatingGeneratorStrategy());
+
+		$this->factory = new LazyLoadingValueHolderFactory($config);
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function instantiateProxy(ContainerInterface $container, Definition $definition, $id, $realInstantiator)
+	{
+		return $this->factory->createProxy(
+			$definition->getClass(),
+			function (&$wrappedInstance, \ProxyManager\Proxy\LazyLoadingInterface $proxy) use ($realInstantiator) {
+				$wrappedInstance = call_user_func($realInstantiator);
+
+				$proxy->setProxyInitializer(null);
+
+				return true;
+			}
+		);
+	}
+}