diff --git a/post.php b/post.php
index ad9d2b0b..50479354 100644
--- a/post.php
+++ b/post.php
@@ -993,7 +993,7 @@ function handle_post(){
         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);
+                $buffer = file_get_contents($upload, false, null, 0, 255);
                 if (preg_match($config['ie_mime_type_detection'], $buffer)) {
                     undoImage($post);
                     error($config['error']['mime_exploit']);