diff --git a/PyConf/python/PyConf/components.py b/PyConf/python/PyConf/components.py
index ed10b42b940f10eb758f5b689eec2168c2c04354..101d657ddc81e22b1ffbc04cb4e5825ca71b9324 100644
--- a/PyConf/python/PyConf/components.py
+++ b/PyConf/python/PyConf/components.py
@@ -58,9 +58,10 @@ _FLOW_GRAPH_OUTPUT_COLOUR = 'coral1'
 
 def __json_dump(obj):
     if hasattr(obj, "to_json"):
-        return obj.to_json();
+        return obj.to_json()
     raise TypeError(repr(obj) + " is not json serializable")
 
+
 def _hash_dict(d):
     """hash a dict with string keys"""
     return hash(json.dumps(d, default=__json_dump, sort_keys=True))