diff --git a/composer.json b/composer.json
index 6cad9397..7cb316bd 100644
--- a/composer.json
+++ b/composer.json
@@ -12,6 +12,7 @@
     ],
     "require": {
         "php": ">=5.3.2",
+        "ext-mongo": "*",
         "symfony/yaml": ">=2.0",
         "symfony/console": ">=2.0",
         "doctrine/common": ">=2.1.0"