diff --git a/lib/statusnet.php b/lib/statusnet.php
index 29e9030267..beeb26cccd 100644
--- a/lib/statusnet.php
+++ b/lib/statusnet.php
@@ -63,7 +63,7 @@ class StatusNet
                 }
             }
             if (!class_exists($pluginclass)) {
-                throw new ServerException(500, "Plugin $name not found.");
+                throw new ServerException("Plugin $name not found.", 500);
             }
         }