diff --git a/agent/scripts/init.d/dev_mgmt_daemon b/agent/scripts/init.d/dev_mgmt_daemon
index 109e34f..3b05b8f 100755
--- a/agent/scripts/init.d/dev_mgmt_daemon
+++ b/agent/scripts/init.d/dev_mgmt_daemon
@@ -19,13 +19,13 @@
 PORT_SPEED_FILE="$APPDIR/port_speed.soc"
 TOPOLOGY_CONFIG_FILE="$APPDIR/topology_config.ini"
 OLT_MODEL=`cat /sys/devices/virtual/dmi/id/board_name`
-if [ $OLT_MODEL = "ASXvOLT16" ]; then
+if [ "$OLT_MODEL" = "ASXvOLT16" ]; then
     Port_100G_SPEED=`cat $PORT_SPEED_FILE | awk -F "port_speed_for_100 " '{print $2}'`
-    [ $Port_100G_SPEED = "10000" ] && TOPOLOGY_CONFIG_FILE="$APPDIR/topology_config_16_ports.ini"
+    [ "$Port_100G_SPEED" = "10000" ] && TOPOLOGY_CONFIG_FILE="$APPDIR/topology_config_16_ports.ini"
     APPARGS="-pcie -d -port_100g_speed $Port_100G_SPEED -topology_config_file $TOPOLOGY_CONFIG_FILE"
-elif [ $OLT_MODEL = "ASGvOLT64" ]; then
+elif [ "$OLT_MODEL" = "ASGvOLT64" ]; then
     Port_100G_SPEED=`cat $PORT_SPEED_FILE | awk -F "port_speed_for_100 " '{print $2}'`
-    [ $Port_100G_SPEED = "10000" ] && TOPOLOGY_CONFIG_FILE="$APPDIR/topology_config_16_ports.ini"
+    [ "$Port_100G_SPEED" = "10000" ] && TOPOLOGY_CONFIG_FILE="$APPDIR/topology_config_16_ports.ini"
     Port_25G_SPEED=`cat $PORT_SPEED_FILE | awk -F "port_speed_for_25 " '{print $2}'`
     APPARGS="-pcie -d -port_100g_speed $Port_100G_SPEED -pcie -port_25g_speed $Port_25G_SPEED -topology_config_file $TOPOLOGY_CONFIG_FILE"
 else