diff --git a/dlls/user/listbox.c b/dlls/user/listbox.c
index 5eb0f99166b..ccee9315c85 100644
--- a/dlls/user/listbox.c
+++ b/dlls/user/listbox.c
@@ -2671,7 +2671,7 @@ static LRESULT WINAPI ListBoxWndProc_common( HWND hwnd, UINT msg,
             SetLastError(ERROR_INVALID_INDEX);
             return LB_ERR;
         }
-        descr->items[wParam].data = (DWORD)lParam;
+        descr->items[wParam].data = lParam;
         return LB_OKAY;
 
     case LB_GETCOUNT16: