diff --git a/src/FileLoader.php b/src/FileLoader.php
index 6f106bf..33c7a4c 100644
--- a/src/FileLoader.php
+++ b/src/FileLoader.php
@@ -40,7 +40,7 @@ public function load($locale, $group, $namespace = null)
     {
         $defaults = [];
 
-        $locale = str_replace('-', '_', $locale);
+        $locale = str_replace('_', '-', $locale);
 
         foreach ($this->paths as $path) {
             $defaults = array_replace_recursive($defaults, $this->loadPath($path, $locale, $group));