diff --git a/lcl/interfaces/win32/win32callback.inc b/lcl/interfaces/win32/win32callback.inc
index 25197bf1b5..0506b6b387 100644
--- a/lcl/interfaces/win32/win32callback.inc
+++ b/lcl/interfaces/win32/win32callback.inc
@@ -1279,7 +1279,7 @@ begin
           end
         else if lWinControl is TCustomCombobox then
           case HIWORD(WParam) of
-            CBN_DROPDOWN: (lWinControl as TCustomCombobox).IntfGetItems;
+            CBN_DROPDOWN: TCustomCombobox(lWinControl).IntfGetItems;
             CBN_EDITCHANGE: LMessage.Msg := LM_CHANGED;
             { CBN_EDITCHANGE is only sent after the user changes the edit box.
               CBN_SELCHANGE is sent when the user changes the text by