diff --git a/src/msw/dde.cpp b/src/msw/dde.cpp
index ad8b5d4a63..ccea317306 100644
--- a/src/msw/dde.cpp
+++ b/src/msw/dde.cpp
@@ -66,14 +66,14 @@ static void DDEDeleteConnection(HCONV hConv);
 static wxDDEServer *DDEFindServer(const wxString& s);
 
 extern "C" HDDEDATA EXPENTRY
-_DDECallback(WORD wType,
-             WORD wFmt,
+_DDECallback(UINT wType,
+             UINT wFmt,
              HCONV hConv,
              HSZ hsz1,
              HSZ hsz2,
              HDDEDATA hData,
-             DWORD lData1,
-             DWORD lData2);
+             ULONG_PTR lData1,
+             ULONG_PTR lData2);
 
 // Add topic name to atom table before using in conversations
 static HSZ DDEAddAtom(const wxString& string);
@@ -149,9 +149,7 @@ extern void wxDDEInitialize()
     if ( !DDEInitialized )
     {
         // Should insert filter flags
-        PFNCALLBACK callback = (PFNCALLBACK)
-            MakeProcInstance((FARPROC)_DDECallback, wxGetInstance());
-        UINT rc = DdeInitialize(&DDEIdInst, callback, APPCLASS_STANDARD, 0L);
+        UINT rc = DdeInitialize(&DDEIdInst, _DDECallback, APPCLASS_STANDARD, 0L);
         if ( rc != DMLERR_NO_ERROR )
         {
             DDELogError(wxT("Failed to initialize DDE"), rc);
@@ -773,14 +771,14 @@ bool wxDDEConnection::DoAdvise(const wxString& item,
 #define DDERETURN HDDEDATA
 
 HDDEDATA EXPENTRY
-_DDECallback(WORD wType,
-             WORD wFmt,
+_DDECallback(UINT wType,
+             UINT wFmt,
              HCONV hConv,
              HSZ hsz1,
              HSZ hsz2,
              HDDEDATA hData,
-             DWORD WXUNUSED(lData1),
-             DWORD WXUNUSED(lData2))
+             ULONG_PTR WXUNUSED(lData1),
+             ULONG_PTR WXUNUSED(lData2))
 {
     switch (wType)
     {