diff --git a/tools/build/options/makeman b/tools/build/options/makeman
--- a/tools/build/options/makeman
+++ b/tools/build/options/makeman
@@ -141,7 +141,7 @@
 	echo "building src.conf.5 man page from files in ${PWD}" >&2
 
 	fbsdid='$'FreeBSD'$'
-  generated='@'generated
+	generated='@'generated
 	cat <<EOF
 .\" DO NOT EDIT-- this file is $generated by tools/build/options/makeman.
 .\" ${fbsdid}