diff --git a/mozilla/content/base/public/nsIXMLHttpRequest.idl b/mozilla/content/base/public/nsIXMLHttpRequest.idl
index 5df63f9ef75..0e1f42fc80f 100644
--- a/mozilla/content/base/public/nsIXMLHttpRequest.idl
+++ b/mozilla/content/base/public/nsIXMLHttpRequest.idl
@@ -279,7 +279,7 @@ interface nsIXMLHttpRequest : nsISupports
 
 
 [scriptable, function, uuid(6459B7CE-6B57-4934-A0AF-0133BA6F9085)]
-interface nsIOnReadystatechangeHandler : nsISupports {
+interface nsIOnReadyStateChangeHandler : nsISupports {
   /**
    * Helper to implement the onreadystatechange callback member.
    * You should not need to use this.
@@ -324,7 +324,7 @@ interface nsIJSXMLHttpRequest : nsISupports {
    * After the initial response, all event listeners will be cleared.
    * Call open() before setting new event listeners.
    */
-  attribute nsIOnReadystatechangeHandler onreadystatechange;
+  attribute nsIOnReadyStateChangeHandler onreadystatechange;
 };
 
 %{ C++
diff --git a/mozilla/content/base/src/nsXMLHttpRequest.cpp b/mozilla/content/base/src/nsXMLHttpRequest.cpp
index 20fd508344d..42dbd911fb7 100644
--- a/mozilla/content/base/src/nsXMLHttpRequest.cpp
+++ b/mozilla/content/base/src/nsXMLHttpRequest.cpp
@@ -362,9 +362,9 @@ nsXMLHttpRequest::DispatchEvent(nsIDOMEvent *evt, PRBool *_retval)
   return NS_OK;
 }
 
-/* attribute nsIOnReadystatechangeHandler onreadystatechange; */
+/* attribute nsIOnReadyStateChangeHandler onreadystatechange; */
 NS_IMETHODIMP
-nsXMLHttpRequest::GetOnreadystatechange(nsIOnReadystatechangeHandler * *aOnreadystatechange)
+nsXMLHttpRequest::GetOnreadystatechange(nsIOnReadyStateChangeHandler * *aOnreadystatechange)
 {
   NS_ENSURE_ARG_POINTER(aOnreadystatechange);
 
@@ -375,7 +375,7 @@ nsXMLHttpRequest::GetOnreadystatechange(nsIOnReadystatechangeHandler * *aOnready
 }
 
 NS_IMETHODIMP
-nsXMLHttpRequest::SetOnreadystatechange(nsIOnReadystatechangeHandler * aOnreadystatechange)
+nsXMLHttpRequest::SetOnreadystatechange(nsIOnReadyStateChangeHandler * aOnreadystatechange)
 {
   mOnReadystatechangeListener = aOnreadystatechange;
 
diff --git a/mozilla/content/base/src/nsXMLHttpRequest.h b/mozilla/content/base/src/nsXMLHttpRequest.h
index be7d19b82b9..8fc34219098 100644
--- a/mozilla/content/base/src/nsXMLHttpRequest.h
+++ b/mozilla/content/base/src/nsXMLHttpRequest.h
@@ -140,7 +140,7 @@ protected:
   nsCOMPtr<nsIDOMEventListener> mOnLoadListener;
   nsCOMPtr<nsIDOMEventListener> mOnErrorListener;
 
-  nsCOMPtr<nsIOnReadystatechangeHandler> mOnReadystatechangeListener;
+  nsCOMPtr<nsIOnReadyStateChangeHandler> mOnReadystatechangeListener;
 
   nsCOMPtr<nsIStreamListener> mXMLParserStreamListener;
   nsCOMPtr<nsIEventQueueService> mEventQService;