diff --git a/mozilla/mailnews/addrbook/src/nsAbWinHelper.cpp b/mozilla/mailnews/addrbook/src/nsAbWinHelper.cpp
index a28cc1ed9d0..9d234541a05 100644
--- a/mozilla/mailnews/addrbook/src/nsAbWinHelper.cpp
+++ b/mozilla/mailnews/addrbook/src/nsAbWinHelper.cpp
@@ -271,7 +271,7 @@ void nsMapiEntryArray::CleanUp(void)
 
 MOZ_DECL_CTOR_COUNTER(nsAbWinHelper)
 
-ULONG nsAbWinHelper::mEntryCounter = 0 ;
+PRUint32 nsAbWinHelper::mEntryCounter = 0 ;
 // There seems to be a deadlock/auto-destruction issue
 // in MAPI when multiple threads perform init/release 
 // operations at the same time. So I've put a mutex
diff --git a/mozilla/mailnews/addrbook/src/nsAbWinHelper.h b/mozilla/mailnews/addrbook/src/nsAbWinHelper.h
index 271aea7d8fb..ca1fab2af10 100644
--- a/mozilla/mailnews/addrbook/src/nsAbWinHelper.h
+++ b/mozilla/mailnews/addrbook/src/nsAbWinHelper.h
@@ -130,7 +130,7 @@ public:
 protected:
     HRESULT mLastError ;
     LPADRBOOK mAddressBook ;
-    static ULONG mEntryCounter ;
+    static PRUint32 mEntryCounter ;
     static PRLock *mMutex ;
 
     // Retrieve the contents of a container, with an optional restriction