diff --git a/target/linux/lantiq/base-files/lib/functions/lantiq_dsl.sh b/target/linux/lantiq/base-files/lib/functions/lantiq_dsl.sh
index aefefcd42b..adf245aa3b 100755
--- a/target/linux/lantiq/base-files/lib/functions/lantiq_dsl.sh
+++ b/target/linux/lantiq/base-files/lib/functions/lantiq_dsl.sh
@@ -31,7 +31,7 @@ dsl_string() {
 dbt() {
 	local a=$(expr $1 / 10)
 	local b=$(expr $1 % 10)
-	echo "${a}.${b}"
+	echo "${a}.${b#-}"
 }
 #
 # Take a number and convert to k or meg