diff --git a/src/applications/config/check/PhabricatorPHPPreflightSetupCheck.php b/src/applications/config/check/PhabricatorPHPPreflightSetupCheck.php
--- a/src/applications/config/check/PhabricatorPHPPreflightSetupCheck.php
+++ b/src/applications/config/check/PhabricatorPHPPreflightSetupCheck.php
@@ -11,25 +11,6 @@
   }
 
   protected function executeChecks() {
-    // TODO: This can be removed entirely because the minimum PHP version is
-    // now PHP 5.5, which does not have safe mode.
-
-    $safe_mode = ini_get('safe_mode');
-    if ($safe_mode) {
-      $message = pht(
-        "You have '%s' enabled in your PHP configuration, but this software ".
-        "will not run in safe mode. Safe mode has been deprecated in PHP 5.3 ".
-        "and removed in PHP 5.4.\n\nDisable safe mode to continue.",
-        'safe_mode');
-
-      $this->newIssue('php.safe_mode')
-        ->setIsFatal(true)
-        ->setName(pht('Disable PHP %s', 'safe_mode'))
-        ->setMessage($message)
-        ->addPHPConfig('safe_mode');
-      return;
-    }
-
     // Check for `disable_functions` or `disable_classes`. Although it's
     // possible to disable a bunch of functions (say, `array_change_key_case()`)
     // and classes and still have Phabricator work fine, it's unreasonably