diff --git a/synamisc.pas b/synamisc.pas
index 7848ccd..22c31e0 100644
--- a/synamisc.pas
+++ b/synamisc.pas
@@ -140,7 +140,7 @@ begin
     for n := 0 to 5 do
     begin
       b := StrToIntDef('$' + MAC[n * 2 + 1] + MAC[n * 2 + 2], 0);
-      HexMac := HexMac + char(b);
+      HexMac := HexMac + AnsiChar(b);
     end;
     if IP = '' then
       IP := cBroadcast;