diff --git a/src/applications/console/controller/DarkConsoleController.php b/src/applications/console/controller/DarkConsoleController.php
--- a/src/applications/console/controller/DarkConsoleController.php
+++ b/src/applications/console/controller/DarkConsoleController.php
@@ -26,7 +26,7 @@
     }
 
     $visible = $request->getStr('visible');
-    if (strlen($visible)) {
+    if (phutil_nonempty_string($visible)) {
       $this->writeDarkConsoleSetting(
         PhabricatorDarkConsoleVisibleSetting::SETTINGKEY,
         (int)$visible);