diff --git a/olsrd/files/olsrd.init b/olsrd/files/olsrd.init
index 887a4a2..5bee27a 100644
--- a/olsrd/files/olsrd.init
+++ b/olsrd/files/olsrd.init
@@ -38,7 +38,7 @@ validate_varname() {
 
 validate_olsrd_option() {
 	local str="$1"
-	[ -z "$str" -o "$str" != "${str%%[! 	0-9A-Za-z./|:_-]*}" ] && return 1
+	[ -z "$str" -o "$str" != "${str%%[! 	0-9A-Za-z.%/|:_-]*}" ] && return 1
 	return 0
 }