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 7be0263d6..97204701f 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
@@ -250,6 +250,10 @@ module.exports = function(RED) {
                 } catch (e) {
                     node.error(RED._("mqtt.errors.invalid-json-parse"), { payload: payload, topic: topic, qos: packet.qos, retain: packet.retain }); return;
                 }
+                if (this.brokerurl.indexOf("mqtts://") > -1 && (!this.usetls || !n.tls)) {
+                    // Default to validating the server cert
+                    this.verifyservercert = true;
+                }
             } else {
                 node.error((RED._("mqtt.errors.invalid-json-string")), { payload: payload, topic: topic, qos: packet.qos, retain: packet.retain }); return;
             }