diff --git a/src/applications/conduit/controller/console/PhabricatorConduitConsoleController.php b/src/applications/conduit/controller/console/PhabricatorConduitConsoleController.php
index c90dc32883..68825fb93d 100644
--- a/src/applications/conduit/controller/console/PhabricatorConduitConsoleController.php
+++ b/src/applications/conduit/controller/console/PhabricatorConduitConsoleController.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * Copyright 2012 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -178,17 +178,10 @@ class PhabricatorConduitConsoleController
     $classes = id(new PhutilSymbolLoader())
       ->setAncestorClass('ConduitAPIMethod')
       ->setType('class')
+      ->setConcreteOnly(true)
       ->selectSymbolsWithoutLoading();
 
-    $class_names = array_values(ipull($classes, 'name'));
-    foreach ($class_names as $key => $class_name) {
-      $class_info = new ReflectionClass($class_name);
-      if ($class_info->isAbstract()) {
-        unset($class_names[$key]);
-      }
-    }
-
-    return array_values($class_names);
+    return array_values(ipull($classes, 'name'));
   }
 
 }
diff --git a/src/applications/drydock/blueprint/base/DrydockBlueprint.php b/src/applications/drydock/blueprint/base/DrydockBlueprint.php
index 8d0982b250..87b2b273f3 100644
--- a/src/applications/drydock/blueprint/base/DrydockBlueprint.php
+++ b/src/applications/drydock/blueprint/base/DrydockBlueprint.php
@@ -39,13 +39,10 @@ abstract class DrydockBlueprint {
       $blueprints = id(new PhutilSymbolLoader())
         ->setType('class')
         ->setAncestorClass('DrydockBlueprint')
+        ->setConcreteOnly(true)
         ->selectAndLoadSymbols();
       $list = ipull($blueprints, 'name', 'name');
       foreach ($list as $class_name => $ignored) {
-        $reflection = new ReflectionClass($class_name);
-        if ($reflection->isAbstract()) {
-          continue;
-        }
         $list[$class_name] = newv($class_name, array());
       }
     }
diff --git a/src/infrastructure/daemon/control/PhabricatorDaemonControl.php b/src/infrastructure/daemon/control/PhabricatorDaemonControl.php
index 6bf66dab1b..819e038373 100644
--- a/src/infrastructure/daemon/control/PhabricatorDaemonControl.php
+++ b/src/infrastructure/daemon/control/PhabricatorDaemonControl.php
@@ -203,7 +203,8 @@ EOHELP
     $symbols = $this->loadAvailableDaemonClasses();
     $symbols = ipull($symbols, 'name', 'name');
     if (empty($symbols[$daemon])) {
-      throw new Exception("Daemon '{$daemon}' is not known.");
+      throw new Exception(
+        "Daemon '{$daemon}' is not loaded, misspelled or abstract.");
     }
 
     $pid_dir = $this->getControlDirectory('pid');
@@ -299,6 +300,7 @@ EOHELP
     $loader = new PhutilSymbolLoader();
     return $loader
       ->setAncestorClass('PhutilDaemon')
+      ->setConcreteOnly(true)
       ->selectSymbolsWithoutLoading();
   }