diff --git a/src/components/filetree.js b/src/components/filetree.js
index f525fd94d..7026172e1 100644
--- a/src/components/filetree.js
+++ b/src/components/filetree.js
@@ -273,7 +273,7 @@ function FileTreeController($scope, $translate, $timeout, Client) {
             if (e.isDirectory) e.icon = 'fa-folder';
             if (e.isSymbolicLink) e.icon = 'fa-link';
             if (e.isFile) {
-                var mimeType = Mimer().get(e.fileName);
+                var mimeType = Mimer().get(e.fileName.toLowerCase());
                 var mimeGroup = mimeType.split('/')[0];
                 if (mimeGroup === 'text') e.icon = 'fa-file-alt';
                 // if (mimeGroup === 'image') e.icon = 'fa-file-image';