diff --git a/source/_integrations/cover.mqtt.markdown b/source/_integrations/cover.mqtt.markdown
index fc10d2fe405..89919b054ac 100644
--- a/source/_integrations/cover.mqtt.markdown
+++ b/source/_integrations/cover.mqtt.markdown
@@ -135,7 +135,7 @@ name:
 optimistic:
   description: Flag that defines if switch works in optimistic mode.
   required: false
-  type: string
+  type: boolean
   default: "`false` if state or position topic defined, else `true`."
 payload_available:
   description: The payload that represents the online state.
diff --git a/source/_integrations/light.mqtt.markdown b/source/_integrations/light.mqtt.markdown
index 7ea6f2b3697..82fa75eb152 100644
--- a/source/_integrations/light.mqtt.markdown
+++ b/source/_integrations/light.mqtt.markdown
@@ -904,7 +904,7 @@ name:
 optimistic:
   description: Flag that defines if the light works in optimistic mode.
   required: false
-  type: string
+  type: boolean
   default: "`true` if no state topic or state template is defined, else `false`."
 payload_available:
   description: The payload that represents the available state.
diff --git a/source/_integrations/lock.mqtt.markdown b/source/_integrations/lock.mqtt.markdown
index a5de9b1cf1c..f2b54c28c8a 100644
--- a/source/_integrations/lock.mqtt.markdown
+++ b/source/_integrations/lock.mqtt.markdown
@@ -122,7 +122,7 @@ name:
 optimistic:
   description: Flag that defines if lock works in optimistic mode.
   required: false
-  type: string
+  type: boolean
   default: "`true` if no `state_topic` defined, else `false`."
 payload_available:
   description: The payload that represents the available state.