diff --git a/include/dde.h b/include/dde.h
index bae151f09a4..832e0d60b23 100644
--- a/include/dde.h
+++ b/include/dde.h
@@ -13,6 +13,10 @@
 
 #include "windef.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define WM_DDE_INITIATE   0x3E0
 #define WM_DDE_TERMINATE  0x3E1
 #define WM_DDE_ADVISE	  0x3E2
@@ -57,4 +61,17 @@ struct tagDDEPOKE
 };
 typedef struct tagDDEPOKE DDEPOKE;
 
+
+/* lParam packing/unpacking API */
+
+LPARAM      WINAPI PackDDElParam(UINT,UINT,UINT);
+BOOL        WINAPI UnpackDDElParam(UINT,LPARAM,PUINT,PUINT);
+BOOL        WINAPI FreeDDElParam(UINT,LPARAM);
+LPARAM      WINAPI ReuseDDElParam(LPARAM,UINT,UINT,UINT,UINT);
+
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __WINE_DDE_H */
diff --git a/include/winuser.h b/include/winuser.h
index 78e58dc24d7..32cc7c28dfc 100644
--- a/include/winuser.h
+++ b/include/winuser.h
@@ -3120,7 +3120,6 @@ BOOL        WINAPI RegisterHotKey(HWND,INT,UINT,UINT);
 HDEVNOTIFY  WINAPI RegisterDeviceNotificationA(HANDLE,LPVOID,DWORD);
 HDEVNOTIFY  WINAPI RegisterDeviceNotificationW(HANDLE,LPVOID,DWORD);
 #define     RegisterDeviceNotification WINELIB_NAME_AW(RegisterDeviceNotification)
-UINT      WINAPI ReuseDDElParam(UINT,UINT,UINT,UINT,UINT);
 BOOL        WINAPI SendMessageCallbackA(HWND,UINT,WPARAM,LPARAM,FARPROC,DWORD);
 BOOL        WINAPI SendMessageCallbackW(HWND,UINT,WPARAM,LPARAM,FARPROC,DWORD);
 #define      SendMessageCallback WINELIB_NAME_AW(SendMessageCallback)
@@ -3140,7 +3139,6 @@ WORD        WINAPI TileWindows (HWND, UINT, const LPRECT,
 INT         WINAPI ToUnicode(UINT,UINT,PBYTE,LPWSTR,int,UINT);
 BOOL      WINAPI TrackPopupMenuEx(HMENU,UINT,INT,INT,HWND,
                                     LPTPMPARAMS);
-UINT      WINAPI UnpackDDElParam(UINT,UINT,UINT*,UINT*);
 BOOL        WINAPI UnregisterDeviceNotification(HDEVNOTIFY);
 BOOL        WINAPI UnregisterHotKey(HWND,INT);
 DWORD       WINAPI WaitForInputIdle(HANDLE,DWORD);