diff --git a/winsup/w32api/include/dde.h b/winsup/w32api/include/dde.h
index 2ea73e7e1..b13e9ce39 100644
--- a/winsup/w32api/include/dde.h
+++ b/winsup/w32api/include/dde.h
@@ -52,10 +52,10 @@ typedef struct {
 } DDEUP;
 BOOL WINAPI DdeSetQualityOfService(HWND,const SECURITY_QUALITY_OF_SERVICE*,PSECURITY_QUALITY_OF_SERVICE);
 BOOL WINAPI ImpersonateDdeClientWindow(HWND,HWND);
-LONG WINAPI PackDDElParam(UINT,UINT,UINT);
-BOOL WINAPI UnpackDDElParam(UINT,LONG,PUINT,PUINT);
-BOOL WINAPI FreeDDElParam(UINT,LONG);
-LONG WINAPI ReuseDDElParam(LONG,UINT,UINT,UINT,UINT);
+LPARAM WINAPI PackDDElParam(UINT,UINT_PTR,UINT_PTR); 
+BOOL WINAPI UnpackDDElParam(UINT,LPARAM,PUINT_PTR,PUINT_PTR); 
+BOOL WINAPI FreeDDElParam(UINT,LPARAM); 
+LPARAM WINAPI ReuseDDElParam(LPARAM,UINT,UINT,UINT_PTR,UINT_PTR); 
 #endif
 
 #ifdef __cplusplus