diff --git a/composer.json b/composer.json
index cb3d69f6..ea95578b 100644
--- a/composer.json
+++ b/composer.json
@@ -20,6 +20,7 @@
         "zendframework/zend-validator": "^2.6"
     },
     "require-dev": {
+        "ext-iconv": "*",
         "zendframework/zend-config": "^2.6",
         "zendframework/zend-servicemanager": "^2.7.5 || ^3.0.3",
         "zendframework/zend-crypt": "^2.6",