diff --git a/plugins/system/helixultimate/src/Platform/Classes/Image.php b/plugins/system/helixultimate/src/Platform/Classes/Image.php
index afc0c9bf..c2259988 100644
--- a/plugins/system/helixultimate/src/Platform/Classes/Image.php
+++ b/plugins/system/helixultimate/src/Platform/Classes/Image.php
@@ -21,6 +21,7 @@ public static function createThumbs($src, $sizes, $folder, $base_name, $ext, $qu
 	{
 
 		list($originalWidth, $originalHeight) = getimagesize($src);
+		$ext = strtolower($ext);
 
 		switch ($ext)
 		{