diff --git a/lcl/include/customlistbox.inc b/lcl/include/customlistbox.inc
index 7b6f18ea34..36a9b192fe 100644
--- a/lcl/include/customlistbox.inc
+++ b/lcl/include/customlistbox.inc
@@ -389,7 +389,7 @@ end;
 
 function TCustomListBox.GetItemHeight: Integer;
 begin
-  if HandleAllocated and (Style <> lbOwnerDrawVariable) then
+  if HandleAllocated and (Style = lbStandard) then
   begin
     with ItemRect(TopIndex) do
       Result := Bottom - Top;