diff --git a/application/File/FileController.php b/application/File/FileController.php
index e0ee74be0..f8e75739d 100644
--- a/application/File/FileController.php
+++ b/application/File/FileController.php
@@ -52,14 +52,17 @@ class FileController extends mfBaseController {
     if (!$fh = fopen($file, 'r')) {
       return false;
     }
-    
+
     set_time_limit(36000);
     header('Content-Type: application/octet-stream');
     header('Content-disposition: attachment; filename="' . $name . '"');
     
     $size = exec('stat -c %s '.escapeshellarg($file));
-    if($size < (pow(2,31))-1) {
-      header('Content-Length: ' . $size);
+    
+    if(strlen($size)) {
+      if($size < (pow(2,31))-1) {
+        header('Content-Length: ' . $size);
+      }
     }
     
     while (!feof($fh)) {