diff --git a/src/applications/auth/controller/mfa/PhabricatorAuthFactorProviderViewController.php b/src/applications/auth/controller/mfa/PhabricatorAuthFactorProviderViewController.php
--- a/src/applications/auth/controller/mfa/PhabricatorAuthFactorProviderViewController.php
+++ b/src/applications/auth/controller/mfa/PhabricatorAuthFactorProviderViewController.php
@@ -83,7 +83,7 @@
 
 
     $custom_enroll = $provider->getEnrollMessage();
-    if (strlen($custom_enroll)) {
+    if (phutil_nonempty_string($custom_enroll)) {
       $view->addSectionHeader(
         pht('Custom Enroll Message'),
         PHUIPropertyListView::ICON_SUMMARY);