diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index 4c3cc81a87..61f2e1555e 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -316,7 +316,7 @@ function system_requirements($phase) {
       $apcu_actual_size = format_size($memory_info['seg_size']);
       $apcu_recommended_size = '32 MB';
       $requirements['php_apcu']['value'] = t('Enabled (@size)', ['@size' => $apcu_actual_size]);
-      if (Bytes::toNumber($apcu_actual_size) < Bytes::toNumber($apcu_recommended_size)) {
+      if ($memory_info['seg_size'] < Bytes::toNumber($apcu_recommended_size)) {
         $requirements['php_apcu']['severity'] = REQUIREMENT_WARNING;
         $requirements['php_apcu']['description'] = t('Depending on your configuration, Drupal can run with a @apcu_size APCu limit. However, a @apcu_default_size APCu limit (the default) or above is recommended, especially if your site uses additional custom or contributed modules.', [
           '@apcu_size' => $apcu_actual_size,