diff --git a/lib/extension/homeassistant.js b/lib/extension/homeassistant.js
index 223bbf72..7dd0b0e2 100644
--- a/lib/extension/homeassistant.js
+++ b/lib/extension/homeassistant.js
@@ -575,6 +575,7 @@ class HomeAssistant {
 
                 if (payload.command_topic_prefix) {
                     payload.command_topic += `${payload.command_topic_prefix}/`;
+                    delete payload.command_topic_prefix;
                 }
 
                 payload.command_topic += 'set';