diff --git a/custom_components/solarman/const.py b/custom_components/solarman/const.py
index 0828ad7..e1ff1a8 100644
--- a/custom_components/solarman/const.py
+++ b/custom_components/solarman/const.py
@@ -7,8 +7,8 @@
 DEFAULT_INVERTER_MB_SLAVEID = 1
 DEFAULT_LOOKUP_FILE = 'deye_hybrid.yaml'
 
+LOOKUP_FILES = (sorted([f for f in os.listdir(os.path.dirname(__file__) + '/inverter_definitions') if f.endswith('.yaml')]))
 
-LOOKUP_FILES = (os.listdir(os.path.dirname(__file__) + '/inverter_definitions'))
 
 MIN_TIME_BETWEEN_UPDATES = timedelta(seconds=15)