diff --git a/ide/frames/compiler_buildmacro_options.pas b/ide/frames/compiler_buildmacro_options.pas
index 64b7c95ad7..f31d7ba9eb 100644
--- a/ide/frames/compiler_buildmacro_options.pas
+++ b/ide/frames/compiler_buildmacro_options.pas
@@ -447,6 +447,8 @@ begin
     if PrefixType=cbmpLong then
       Result:=Result+'macro';
   end;
+
+  Result := Result.Replace('.', '_')
 end;
 
 procedure TCompOptBuildMacrosFrame.UpdateItemPropertyControls;