diff --git a/post.php b/post.php
index b5c03b38..328aedc1 100644
--- a/post.php
+++ b/post.php
@@ -1332,15 +1332,6 @@ function handle_post(Context $ctx)
     if ($post['has_file']) {
         foreach ($post['files'] as $key => &$file) {
             if ($file['is_an_image']) {
-                if ($config['ie_mime_type_detection'] !== false) {
-                    // Check IE MIME type detection XSS exploit
-                    $buffer = file_get_contents($upload, null, null, null, 255);
-                    if (preg_match($config['ie_mime_type_detection'], $buffer)) {
-                        undoImage($post);
-                        error($config['error']['mime_exploit']);
-                    }
-                }
-
                 require_once 'inc/image.php';
 
                 // find dimensions of an image using GD