diff --git a/src/workflow/ArcanistWorkflow.php b/src/workflow/ArcanistWorkflow.php
--- a/src/workflow/ArcanistWorkflow.php
+++ b/src/workflow/ArcanistWorkflow.php
@@ -480,7 +480,7 @@
       // token-based authentication. Use that instead of all the certificate
       // stuff.
       $token = idx($credentials, 'token', '');
-      if (strlen($token)) {
+      if (phutil_nonempty_string($token)) {
         $conduit = $this->getConduit();
 
         $conduit->setConduitToken($token);