diff --git a/packages/winunits-base/src/activex.pp b/packages/winunits-base/src/activex.pp
index 71d0af6507..c84d897457 100644
--- a/packages/winunits-base/src/activex.pp
+++ b/packages/winunits-base/src/activex.pp
@@ -4541,7 +4541,7 @@ type
   procedure CoTaskMemFree(_para1:PVOID);stdcall; external  'ole32.dll' name 'CoTaskMemFree';
 
 {$ifndef wince}
-  function CreateDataAdviseHolder(_para1:IDataAdviseHolder):HRESULT;stdcall; external  'ole32.dll' name 'CreateDataAdviseHolder';
+  function CreateDataAdviseHolder(out _para1:IDataAdviseHolder):HRESULT;stdcall; external  'ole32.dll' name 'CreateDataAdviseHolder';
   function CreateDataCache(_para1:IUnknown; const _para2:TCLSID; const _para3:TIID; out _para4):HRESULT;stdcall; external  'ole32.dll' name 'CreateDataCache';
 {$endif wince}