diff --git a/composer.json b/composer.json
index 70a50f09c..a1a7ebb49 100644
--- a/composer.json
+++ b/composer.json
@@ -30,20 +30,19 @@
     "require": {
         "php": ">=5.5.9",
         "ext-pcre": "*",
-        "ext-DOM": "*",
+        "ext-dom": "*",
         "ext-curl": "*",
         "ext-gd": "*",
         "ext-session": "*",
-        "ext-Ctype": "*",
+        "ext-ctype": "*",
         "ext-hash": "*",
         "ext-simplexml": "*",
         "ext-json": "*",
         "ext-mbstring": "*",
         "ext-xml": "*",
         "ext-iconv": "*",
-        "ext-gettext": "*",
         "ext-tokenizer": "*",
-        "ext-PDO": "*",
+        "ext-pdo": "*",
         "symfony/symfony": "3.0.*",
         "doctrine/orm": "^2.5",
         "doctrine/doctrine-bundle": "^1.6",