diff --git a/composer.json b/composer.json
index ac855e1..38048fd 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,8 @@
 
     "require": {
         "php": ">=5.3.2",
-        "symfony/framework-bundle": ">=2.0|~3.0"
+        "symfony/framework-bundle": ">=2.0|~3.0",
+        "ext-soap": "*"
     },
 
     "autoload": {