diff --git a/modules/backend/widgets/MediaManager.php b/modules/backend/widgets/MediaManager.php
index 2d35b29bc..b9de13fbf 100644
--- a/modules/backend/widgets/MediaManager.php
+++ b/modules/backend/widgets/MediaManager.php
@@ -1205,7 +1205,7 @@ class MediaManager extends WidgetBase
      */
     protected function validateFileName($name)
     {
-        if (!preg_match('/^[0-9a-z@\.\s_\-]+$/i', $name)) {
+        if (!preg_match('/^[\w@\.\s_\-]+$/iu', $name)) {
             return false;
         }
 
diff --git a/modules/system/classes/MediaLibrary.php b/modules/system/classes/MediaLibrary.php
index 64a6b2783..045f5840b 100644
--- a/modules/system/classes/MediaLibrary.php
+++ b/modules/system/classes/MediaLibrary.php
@@ -475,7 +475,7 @@ class MediaLibrary
         /*
          * Validate folder names
          */
-        if (!preg_match('/^[0-9a-z@\.\s_\-\/]+$/i', $path)) {
+        if (!preg_match('/^[\w@\.\s_\-\/]+$/iu', $path)) {
             throw new ApplicationException(Lang::get('system::lang.media.invalid_path', compact('path')));
         }