diff --git a/src/workflow/ArcanistShellCompleteWorkflow.php b/src/workflow/ArcanistShellCompleteWorkflow.php
--- a/src/workflow/ArcanistShellCompleteWorkflow.php
+++ b/src/workflow/ArcanistShellCompleteWorkflow.php
@@ -82,10 +82,7 @@
           continue;
         }
 
-        $supported = $workflow->getSupportedRevisionControlSystems();
-
-        $ok = (in_array('any', $supported) || in_array($vcs, $supported));
-        if (!$ok) {
+        if (!in_array($vcs, $workflow->getSupportedRevisionControlSystems())) {
           continue;
         }
 
diff --git a/src/workflow/ArcanistWorkflow.php b/src/workflow/ArcanistWorkflow.php
--- a/src/workflow/ArcanistWorkflow.php
+++ b/src/workflow/ArcanistWorkflow.php
@@ -1216,7 +1216,7 @@
   }
 
   protected function getSupportedRevisionControlSystems() {
-    return array('any');
+    return array('git', 'hg', 'svn');
   }
 
   final protected function getPassthruArgumentsAsMap($command) {