diff --git a/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js b/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js
index 4945c5c8b..b4fbfcc35 100644
--- a/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js
+++ b/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js
@@ -134,6 +134,9 @@ module.exports = function(RED) {
                             agent: agent
                         }
                     }
+                if (this.brokerurl.indexOf("mqtts://") > -1 && (!this.usetls || !n.tls))
+                    // Default to validating the server cert
+                    this.verifyservercert = true;
             } else {
                 // construct the std mqtt:// url
                 if (this.usetls) {