diff --git a/core/includes/common.inc b/core/includes/common.inc
index f32e581b00..aee6a56461 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -261,7 +261,6 @@ function format_size($size, $langcode = NULL) {
   }
   else {
     // Convert bytes to kilobytes.
-    $positive = $size >= 0;
     $temp_size = abs($size);
     foreach (['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'] as $unit) {
       if (round($temp_size, 2) < Bytes::KILOBYTE) {
@@ -269,7 +268,7 @@ function format_size($size, $langcode = NULL) {
       }
       $temp_size = $temp_size / Bytes::KILOBYTE;
     }
-    $args = ['@size' => $positive ? round($temp_size, 2) : -round($temp_size, 2)];
+    $args = ['@size' => $size >= 0 ? round($temp_size, 2) : -round($temp_size, 2)];
     $options = ['langcode' => $langcode];
     switch ($unit) {
       case 'KB':