diff --git a/composer.json b/composer.json
index a9080a94..bb45eb12 100644
--- a/composer.json
+++ b/composer.json
@@ -36,6 +36,7 @@
 
     "require": {
         "php": ">=5.3.8",
+        "ext-mcrypt": "*",
         "ext-pdo": "*",
         "ext-pdo_mysql": "*",
         "block8/b8framework": "~1.0",