diff --git a/homeassistant/components/mqtt/alarm_control_panel.py b/homeassistant/components/mqtt/alarm_control_panel.py
index dddf8986ca0..a960367ad11 100644
--- a/homeassistant/components/mqtt/alarm_control_panel.py
+++ b/homeassistant/components/mqtt/alarm_control_panel.py
@@ -177,7 +177,7 @@ class MqttAlarm(MqttEntity, alarm.AlarmControlPanelEntity):
 
         if (code := self._config.get(CONF_CODE)) is None:
             self._attr_code_format = None
-        elif code == REMOTE_CODE or (isinstance(code, str) and code.isdigit()):
+        elif code == REMOTE_CODE or str(code).isdigit():
             self._attr_code_format = alarm.CodeFormat.NUMBER
         else:
             self._attr_code_format = alarm.CodeFormat.TEXT
diff --git a/homeassistant/components/mqtt/device_tracker.py b/homeassistant/components/mqtt/device_tracker.py
index 2557a2afb5d..1293121e0a8 100644
--- a/homeassistant/components/mqtt/device_tracker.py
+++ b/homeassistant/components/mqtt/device_tracker.py
@@ -3,6 +3,7 @@ from __future__ import annotations
 
 from collections.abc import Callable
 import functools
+from typing import TYPE_CHECKING
 
 import voluptuous as vol
 
@@ -137,7 +138,8 @@ class MqttDeviceTracker(MqttEntity, TrackerEntity):
             elif payload == self._config[CONF_PAYLOAD_RESET]:
                 self._location_name = None
             else:
-                assert isinstance(msg.payload, str)
+                if TYPE_CHECKING:
+                    assert isinstance(msg.payload, str)
                 self._location_name = msg.payload
 
         state_topic: str | None = self._config.get(CONF_STATE_TOPIC)