diff --git a/composer.json b/composer.json
index d7df4a23..ddc3bdf7 100644
--- a/composer.json
+++ b/composer.json
@@ -14,6 +14,7 @@
     "require": {
         "php": ">=5.4.0",
         "ext-fileinfo": "*",
+        "ext-mbstring": "*",
         "guzzlehttp/psr7": "~1.1"
     },
     "require-dev": {
diff --git a/src/Intervention/Image/AbstractDriver.php b/src/Intervention/Image/AbstractDriver.php
index 29ad9d59..5ece0a1c 100644
--- a/src/Intervention/Image/AbstractDriver.php
+++ b/src/Intervention/Image/AbstractDriver.php
@@ -102,11 +102,11 @@ abstract class AbstractDriver
      */
     private function getCommandClassName($name)
     {
-        $name = mb_convert_case($name[0], MB_CASE_UPPER, 'utf-8') . mb_substr($name, 1, mb_strlen($name));
+        $name = mb_strtoupper(mb_substr($name, 0, 1)) . mb_substr($name, 1);
         
         $drivername = $this->getDriverName();
-        $classnameLocal = sprintf('\Intervention\Image\%s\Commands\%sCommand', $drivername, ucfirst($name));
-        $classnameGlobal = sprintf('\Intervention\Image\Commands\%sCommand', ucfirst($name));
+        $classnameLocal = sprintf('\Intervention\Image\%s\Commands\%sCommand', $drivername, $name);
+        $classnameGlobal = sprintf('\Intervention\Image\Commands\%sCommand', $name);
 
         if (class_exists($classnameLocal)) {
             return $classnameLocal;