diff --git a/obuspa/files/etc/init.d/obuspa b/obuspa/files/etc/init.d/obuspa
index d5a6a5717..749a0dae5 100755
--- a/obuspa/files/etc/init.d/obuspa
+++ b/obuspa/files/etc/init.d/obuspa
@@ -188,7 +188,8 @@ configure_obuspa() {
 	export USP_BOARD_IFNAME=${l3device}
 
 	# Set this variable for root user
-	echo "export USP_BOARD_IFNAME=${l3device}">>/root/.profile
+	grep -q USP_BOARD_IFNAME /root/.profile || \
+		echo "export USP_BOARD_IFNAME=${l3device}" >> /root/.profile
 
 	[ -f $cert ] && certificate=$cert