diff --git a/src/mqtt.js b/src/mqtt.js
index 6b473a1..dd2b3e6 100644
--- a/src/mqtt.js
+++ b/src/mqtt.js
@@ -32,9 +32,9 @@ const options = commandLineArgs([
 ]);
 
 // get options and fallback to default values
-const mqttBrokerUrl = options["mqtt-broker-url"] || "mqtt://mqtt.meshtastic.org";
-const mqttUsername = options["mqtt-username"] || "meshdev";
-const mqttPassword = options["mqtt-password"] || "large4cats";
+const mqttBrokerUrl = options["mqtt-broker-url"] ?? "mqtt://mqtt.meshtastic.org";
+const mqttUsername = options["mqtt-username"] ?? "meshdev";
+const mqttPassword = options["mqtt-password"] ?? "large4cats";
 const collectServiceEnvelopes = options["collect-service-envelopes"] ?? false;
 
 // create mqtt client