diff --git a/modules/color/color.module b/modules/color/color.module
index ff6c70e..2c05b74 100644
--- a/modules/color/color.module
+++ b/modules/color/color.module
@@ -301,7 +301,7 @@ function color_scheme_form_submit($form, &$form_state) {
     // We need at least a copy of the source and a target buffer of the same
     // size (both at 32bpp).
     $required = $width * $height * 8;
-    $usage = memory_get_usage();
+    $usage = memory_get_usage(TRUE);
     $limit = parse_size(ini_get('memory_limit'));
     if ($usage + $required > $limit) {
       drupal_set_message(t('There is not enough memory available to PHP to change this theme\'s color scheme. You need at least %size more. Check the <a href="@url">PHP documentation</a> for more information.', array('%size' => format_size($usage + $required - $limit), '@url' => 'http://www.php.net/manual/ini.core.php#ini.sect.resource-limits')), 'error');