diff --git a/exec/asc_handler.js b/exec/asc_handler.js
index d691bd885d0e4cae7d78f925ad3e0b14c9ca7083..43d2136a67e46efec698058dbff8ae4a0089f50a 100644
--- a/exec/asc_handler.js
+++ b/exec/asc_handler.js
@@ -33,7 +33,7 @@ writeln("<meta http-equiv='Content-Type' content='text/html; charset=UTF-8'>");
writeln("<title>"+file.name.replace(/^.*[\/\\]/,'')+"</title>");
writeln("</head>");
writeln('<body style="background-color: black;">');
-writeln("<pre>");
+writeln('<pre style="font-family: Courier New, monospace">');
write(html_encode(text.join("\r\n")
,/* es-ASCII: */true
,/* white-sp: */false