diff --git a/dom/base/nsDOMScriptObjectFactory.cpp b/dom/base/nsDOMScriptObjectFactory.cpp
index e48575a18dc..b1775908b88 100644
--- a/dom/base/nsDOMScriptObjectFactory.cpp
+++ b/dom/base/nsDOMScriptObjectFactory.cpp
@@ -91,7 +91,6 @@ nsDOMScriptObjectFactory::nsDOMScriptObjectFactory() :
       xs->RegisterExceptionProvider(provider, NS_ERROR_MODULE_DOM_XPATH);
       xs->RegisterExceptionProvider(provider, NS_ERROR_MODULE_DOM_INDEXEDDB);
       xs->RegisterExceptionProvider(provider, NS_ERROR_MODULE_XPCONNECT);
-      xs->RegisterExceptionProvider(provider, NS_ERROR_MODULE_DOM_EVENTS);
     }
 
     NS_ASSERTION(!gExceptionProvider, "Registered twice?!");
@@ -291,8 +290,6 @@ nsDOMScriptObjectFactory::Observe(nsISupports *aSubject,
                                         NS_ERROR_MODULE_DOM_XPATH);
         xs->UnregisterExceptionProvider(gExceptionProvider,
                                         NS_ERROR_MODULE_XPCONNECT);
-        xs->UnregisterExceptionProvider(gExceptionProvider,
-                                        NS_ERROR_MODULE_DOM_EVENTS);
       }
 
       NS_RELEASE(gExceptionProvider);
diff --git a/xpcom/base/nsError.h b/xpcom/base/nsError.h
index 13244907240..06ef1f1ca1b 100644
--- a/xpcom/base/nsError.h
+++ b/xpcom/base/nsError.h
@@ -98,7 +98,6 @@
 #define NS_ERROR_MODULE_SCHEMA     31
 #define NS_ERROR_MODULE_DOM_FILE   32
 #define NS_ERROR_MODULE_DOM_INDEXEDDB 33
-#define NS_ERROR_MODULE_DOM_EVENTS 34
 
 /* NS_ERROR_MODULE_GENERAL should be used by modules that do not
  * care if return code values overlap. Callers of methods that