diff --git a/heatmiserv3/heatmiser.py b/heatmiserv3/heatmiser.py
index fad1ec5..4c7ef91 100644
--- a/heatmiserv3/heatmiser.py
+++ b/heatmiserv3/heatmiser.py
@@ -23,8 +23,7 @@ def __init__(self, address, model, uh1):
         self.address = address
         self.model = model
         try:
-            with open(config_yml) as config_file:
-                self.config = yaml.safe_load(config_file)[model]
+            self.config = yaml.safe_load(config_yml)[model]
         except yaml.YAMLError as exc:
             logging.info("The YAML file is invalid: %s", exc)
         self.conn = uh1.registerThermostat(self)