diff --git a/src/java/com/threerings/presents/data/InvocationMarshaller.java b/src/java/com/threerings/presents/data/InvocationMarshaller.java
index 87da068c4..243e40c1d 100644
--- a/src/java/com/threerings/presents/data/InvocationMarshaller.java
+++ b/src/java/com/threerings/presents/data/InvocationMarshaller.java
@@ -237,6 +237,17 @@ public class InvocationMarshaller
         return _invCode;
     }
 
+    /**
+     * A convenience method to indicate that the listener is not going
+     * to be responded-to, and that this is ok.
+     */
+    public static void setNoResponse (InvocationListener listener)
+    {
+        if (listener instanceof ListenerMarshaller) {
+            ((ListenerMarshaller) listener).setNoResponse();
+        }
+    }
+
     /**
      * Called by generated invocation marshaller code; packages up and
      * sends the specified invocation service request.
diff --git a/src/java/com/threerings/whirled/server/SceneProvider.java b/src/java/com/threerings/whirled/server/SceneProvider.java
index 4a6bfec38..24d464177 100644
--- a/src/java/com/threerings/whirled/server/SceneProvider.java
+++ b/src/java/com/threerings/whirled/server/SceneProvider.java
@@ -74,8 +74,7 @@ public class SceneProvider
                     Log.info("Abandoning scene move, client gone " +
                              "[who=" + source.who()  +
                              ", dest=" + scmgr.where() + "].");
-                    ((InvocationMarshaller.ListenerMarshaller) listener).
-                        setNoResponse();
+                    InvocationMarshaller.setNoResponse(listener);
                     return;
                 }
                 finishMoveToRequest(source, scmgr, sceneVer, listener);
diff --git a/src/java/com/threerings/whirled/spot/server/SpotProvider.java b/src/java/com/threerings/whirled/spot/server/SpotProvider.java
index 05a397744..495f878f8 100644
--- a/src/java/com/threerings/whirled/spot/server/SpotProvider.java
+++ b/src/java/com/threerings/whirled/spot/server/SpotProvider.java
@@ -80,7 +80,7 @@ public class SpotProvider
             Log.info("Ignoring stale traverse portal request " +
                      "[caller=" + caller.who() + ", oSceneId=" + sceneId +
                      ", portalId=" + portalId + ", cSceneId=" + cSceneId + "].");
-            ((InvocationMarshaller.ListenerMarshaller) listener).setNoResponse();
+            InvocationMarshaller.setNoResponse(listener);
             return;
         }
 
@@ -131,8 +131,7 @@ public class SpotProvider
                         Log.info("Abandoning portal traversal, client gone " +
                                  "[who=" + fsource.who()  +
                                  ", dest=" + scmgr.where() + "].");
-                        ((InvocationMarshaller.ListenerMarshaller) flistener).
-                            setNoResponse();
+                        InvocationMarshaller.setNoResponse(flistener);
                         return;
                     }