diff --git a/src/workflow/ArcanistBranchWorkflow.php b/src/workflow/ArcanistBranchWorkflow.php
index 29d3b7b1..7c980ef4 100644
--- a/src/workflow/ArcanistBranchWorkflow.php
+++ b/src/workflow/ArcanistBranchWorkflow.php
@@ -1,37 +1,36 @@
 <?php
 
 /**
  * Alias for `arc feature`.
  */
 final class ArcanistBranchWorkflow extends ArcanistFeatureWorkflow {
 
   public function getWorkflowName() {
     return 'branch';
   }
 
   public function getCommandSynopses() {
     return phutil_console_format(<<<EOTEXT
       **branch** [__options__]
       **branch** __name__ [__start__]
 EOTEXT
       );
   }
 
   public function getCommandHelp() {
     return phutil_console_format(<<<EOTEXT
           Supports: git
           Alias for arc feature.
 EOTEXT
       );
   }
 
+  public function getSupportedRevisionControlSystems() {
+    return array('git');
+  }
+
   public function run() {
-    $repository_api = $this->getRepositoryAPI();
-    if (!($repository_api instanceof ArcanistGitAPI)) {
-      throw new ArcanistUsageException(
-        'arc branch is only supported under Git.');
-    }
     return parent::run();
   }
 
 }