diff --git a/dhcp_script.py b/dhcp_script.py
index 64e67fe..d159266 100644
--- a/dhcp_script.py
+++ b/dhcp_script.py
@@ -67,7 +67,7 @@ def m_pub(current_dir, mosquittoKeySet, mqttCfg, topicPath, data):
     command = "mosquitto_pub -h "
     command += mqttCfg['host']
     command += " -p "
-    command += mqttCfg['port']
+    command += str(mqttCfg['port'])
     command += " -u "
     command += mosquittoKeySet['user']
     command += " -P "