diff --git a/source/_docs/mqtt/discovery.markdown b/source/_docs/mqtt/discovery.markdown
index 415c91fecc4..069ce54eadf 100644
--- a/source/_docs/mqtt/discovery.markdown
+++ b/source/_docs/mqtt/discovery.markdown
@@ -28,7 +28,6 @@ MQTT discovery is enabled by default. To disable MQTT discovery, add the followi
 # Example configuration.yaml entry
 mqtt:
   discovery: false
-  discovery_prefix: homeassistant
 ```
 
 {% configuration %}