diff --git a/ideintf/componenttreeview.pas b/ideintf/componenttreeview.pas
index 7d84202c6c..6d0327d99b 100644
--- a/ideintf/componenttreeview.pas
+++ b/ideintf/componenttreeview.pas
@@ -254,7 +254,7 @@ begin
   inherited Create(TheOwner);
   DragMode := dmAutomatic;
   FComponentList:=TBackupComponentList.Create;
-  Options:=Options+[tvoAllowMultiselect,tvoAutoItemHeight,tvoKeepCollapsedNodes];
+  Options := Options + [tvoAllowMultiselect, tvoAutoItemHeight, tvoKeepCollapsedNodes, tvoReadOnly];
   FImageList := TImageList.Create(nil);
   FImageList.AddLazarusResource('oi_form');
   FImageList.AddLazarusResource('oi_comp');