core/includes/bootstrap.inc                | 2 +-
 core/modules/simpletest/simpletest.install | 4 ++--
 core/modules/system/system.install         | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/core/includes/bootstrap.inc b/core/includes/bootstrap.inc
index e2a381e..a560d53 100644
--- a/core/includes/bootstrap.inc
+++ b/core/includes/bootstrap.inc
@@ -46,7 +46,7 @@
 /**
  * Minimum recommended value of PHP memory_limit.
  */
-const DRUPAL_MINIMUM_PHP_MEMORY_LIMIT = '32 MiB';
+const DRUPAL_MINIMUM_PHP_MEMORY_LIMIT = '32M';
 
 /**
  * Error reporting level: display no errors.
diff --git a/core/modules/simpletest/simpletest.install b/core/modules/simpletest/simpletest.install
index 17a64e1..5aabde1 100644
--- a/core/modules/simpletest/simpletest.install
+++ b/core/modules/simpletest/simpletest.install
@@ -8,7 +8,7 @@
 /**
  * Minimum value of PHP memory_limit for SimpleTest.
  */
-const SIMPLETEST_MINIMUM_PHP_MEMORY_LIMIT = '64 MiB';
+const SIMPLETEST_MINIMUM_PHP_MEMORY_LIMIT = '64M';
 
 /**
  * Implements hook_requirements().
@@ -61,7 +61,7 @@ function simpletest_requirements($phase) {
 
   // Check the current memory limit. If it is set too low, SimpleTest will fail
   // to load all tests and throw a fatal error.
-  if (!drupal_check_memory_limit(SIMPLETEST_MINIMUM_PHP_MEMORY_LIMIT)) {
+  if (!drupal_check_memory_limit(parse_byte_count(SIMPLETEST_MINIMUM_PHP_MEMORY_LIMIT, TRUE))) {
     $requirements['php_memory_limit']['severity'] = REQUIREMENT_ERROR;
     $requirements['php_memory_limit']['description'] = t('The testing framework requires the PHP memory limit to be at least %memory_minimum_limit. The current value is %memory_limit. <a href="@url">Follow these steps to continue</a>.', array('%memory_limit' => $memory_limit, '%memory_minimum_limit' => SIMPLETEST_MINIMUM_PHP_MEMORY_LIMIT, '@url' => 'http://drupal.org/node/207036'));
   }
diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index 04bf86d..6a5ac17 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -203,7 +203,7 @@ function system_requirements($phase) {
     'value' => $memory_limit ? format_byte_count($memory_limit, TRUE) : t("Unlimited"),
   );
 
-  if (!drupal_check_memory_limit(DRUPAL_MINIMUM_PHP_MEMORY_LIMIT)) {
+  if (!drupal_check_memory_limit(parse_byte_count(DRUPAL_MINIMUM_PHP_MEMORY_LIMIT, TRUE))) {
     $description = '';
     if ($phase == 'install') {
       $description = t('Consider increasing your PHP memory limit to %memory_minimum_limit to help prevent errors in the installation process.', array('%memory_minimum_limit' => DRUPAL_MINIMUM_PHP_MEMORY_LIMIT));