diff --git a/Makefile b/Makefile
index 157e561..43bc1d7 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,7 @@ install: ${NAME}
 man: doc/${NAME}.1.txt
 
 doc/${NAME}.1.txt: doc/${NAME}.1
-	nroff -man $? | col -b >$@
+	mandoc -T ascii -c -O width=80 $? | col -b > $@
 
 readme: man
 	sed -n -e '/^NAME/!p;//q' README.md >.readme