diff -u b/core/modules/system/system.install b/core/modules/system/system.install
--- b/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -316,6 +316,8 @@
     if (extension_loaded('apcu') && filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN)) {
       $memory_info = apcu_sma_info(TRUE);
       $apcu_actual_size = format_size($memory_info['seg_size']);
+      $apcu_exploded = explode(' ', $apcu_actual_size);
+      $apcu_actual_size = $apcu_exploded[0] * 0.001 . ' MB';
       $apcu_recommended_size = '32 MB';
       $requirements['php_apcu']['value'] = t('Enabled (@size)', ['@size' => $apcu_actual_size]);
       if (Bytes::toInt($apcu_actual_size) < Bytes::toInt($apcu_recommended_size)) {