diff --git a/avs/config.py b/avs/config.py
index cdce658..3387773 100644
--- a/avs/config.py
+++ b/avs/config.py
@@ -9,6 +9,9 @@
 
 
 def load(configfile=DEFAULT_CONFIG_FILE):
+    if configfile is None:
+        configfile = DEFAULT_CONFIG_FILE
+        
     if not os.path.isfile(configfile):
         raise RuntimeError('No configuration file')
 
diff --git a/setup.py b/setup.py
index fda7f6d..ad55650 100644
--- a/setup.py
+++ b/setup.py
@@ -28,7 +28,7 @@
 
 setup(
     name='avs',
-    version='0.5.2',
+    version='0.5.3',
     description="Alexa Voice Service Python SDK",
     long_description=long_description,
     long_description_content_type='text/markdown',