diff --git a/m4/main.html.m4 b/m4/main.html.m4
index 696dc91..f03a317 100644
--- a/m4/main.html.m4
+++ b/m4/main.html.m4
@@ -2,7 +2,7 @@ dnl template.m4.html v1.3-p1
dnl Part of the tape-and-string suite used to construct the website
include(`m4/lib.m4')dnl
ifdef(`CSS_INC',`', define(`CSS_INC', `main'))dnl
-ifelse(CSS_INC,`dnd',define(`CSS_INC',`dnd'))dnl
+ifelse(CSS_INC,`dnd',define(`CSS_INC',`main'))dnl
define(`_CSS',`/css/CSS_INC.css')dnl