diff --git a/homeassistant/components/syncthru/sensor.py b/homeassistant/components/syncthru/sensor.py
index fe95d7c7e20..3a41002948c 100644
--- a/homeassistant/components/syncthru/sensor.py
+++ b/homeassistant/components/syncthru/sensor.py
@@ -31,10 +31,10 @@ DEFAULT_MONITORED_CONDITIONS.extend(
     ['drum_{}'.format(key) for key in DRUM_COLORS]
 )
 DEFAULT_MONITORED_CONDITIONS.extend(
-    ['trays_{}'.format(key) for key in TRAYS]
+    ['tray_{}'.format(key) for key in TRAYS]
 )
 DEFAULT_MONITORED_CONDITIONS.extend(
-    ['output_trays_{}'.format(key) for key in OUTPUT_TRAYS]
+    ['output_tray_{}'.format(key) for key in OUTPUT_TRAYS]
 )
 
 PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({