diff --git a/src/main/as/com/threerings/crowd/client/CrowdClient.as b/src/main/as/com/threerings/crowd/client/CrowdClient.as
index 1481adf63..892bdc6e2 100644
--- a/src/main/as/com/threerings/crowd/client/CrowdClient.as
+++ b/src/main/as/com/threerings/crowd/client/CrowdClient.as
@@ -38,7 +38,7 @@ public class CrowdClient extends Client
     BodyMarshaller;
     CrowdPermissionPolicy;
 
-    public function CrowdClient (creds :Credentials)
+    public function CrowdClient (creds :Credentials = null)
     {
         super(creds);
     }
diff --git a/src/main/as/com/threerings/presents/client/Client.as b/src/main/as/com/threerings/presents/client/Client.as
index ab7a4b6fd..522c887a3 100644
--- a/src/main/as/com/threerings/presents/client/Client.as
+++ b/src/main/as/com/threerings/presents/client/Client.as
@@ -57,7 +57,7 @@ public class Client extends EventDispatcher
     // statically reference classes we require
     TimeBaseMarshaller;
 
-    public function Client (creds :Credentials)
+    public function Client (creds :Credentials = null)
     {
         _creds = creds;
     }