diff --git a/src/publischer.rs b/src/publischer.rs
index 4e4017f..70b3f6e 100644
--- a/src/publischer.rs
+++ b/src/publischer.rs
@@ -43,7 +43,7 @@ impl PulseTx {
                     }});
                     self.tx({ mqtt_client::MqttMessage {
                         topic: String::from("/kees/energy/metalbox/data"),
-                        payload: format!("{\"pulses\":{pulses},\"watt\":{}", pulses * 60),
+                        payload: format!("{{\"pulses\":{pulses},\"watt\":{}}}", pulses * 60),
                         retain: false,
                         qos: mqtt_client::QoS::AtMostOnce,
                     }});