diff --git a/ideintf/graphpropedits.pas b/ideintf/graphpropedits.pas
index 9e8710ad80..3ceae0fd4a 100644
--- a/ideintf/graphpropedits.pas
+++ b/ideintf/graphpropedits.pas
@@ -400,6 +400,7 @@ begin
       end
       else if ABitmap<>nil then begin
         ABitmap.FreeImage;
+        Modified;
       end;
     end;
   finally