diff --git a/compiler/optutils.pas b/compiler/optutils.pas
index 8a4a74f7bd..12e231b0a7 100644
--- a/compiler/optutils.pas
+++ b/compiler/optutils.pas
@@ -133,6 +133,8 @@ unit optutils;
               write(text(arg^),' Successor: ',nodetype2str[n.successor.nodetype],'(',n.successor.fileinfo.line,',',n.successor.fileinfo.column,')')
             else
               write(text(arg^),' Successor: nil');
+            write(text(arg^),' DefSum: ');
+            PrintDFASet(text(arg^),n.optinfo^.defsum);
             writeln(text(arg^));
           end;
         result:=fen_false;