diff --git a/homeassistant/components/rfxtrx/sensor.py b/homeassistant/components/rfxtrx/sensor.py
index c72d2e288e1..68c29e20328 100644
--- a/homeassistant/components/rfxtrx/sensor.py
+++ b/homeassistant/components/rfxtrx/sensor.py
@@ -28,6 +28,7 @@ from homeassistant.const import (
     ELECTRIC_CURRENT_AMPERE,
     ELECTRIC_POTENTIAL_VOLT,
     ENERGY_KILO_WATT_HOUR,
+    ENTITY_CATEGORY_DIAGNOSTIC,
     LENGTH_MILLIMETERS,
     PERCENTAGE,
     POWER_WATT,
@@ -86,6 +87,7 @@ SENSOR_TYPES = (
         state_class=STATE_CLASS_MEASUREMENT,
         native_unit_of_measurement=PERCENTAGE,
         convert=_battery_convert,
+        entity_category=ENTITY_CATEGORY_DIAGNOSTIC,
     ),
     RfxtrxSensorEntityDescription(
         key="Current",
@@ -129,6 +131,7 @@ SENSOR_TYPES = (
         state_class=STATE_CLASS_MEASUREMENT,
         native_unit_of_measurement=SIGNAL_STRENGTH_DECIBELS_MILLIWATT,
         convert=_rssi_convert,
+        entity_category=ENTITY_CATEGORY_DIAGNOSTIC,
     ),
     RfxtrxSensorEntityDescription(
         key="Temperature",