diff --git a/pyaccuwage/__init__.py b/pyaccuwage/__init__.py
index 2de4c7b..a6775be 100644
--- a/pyaccuwage/__init__.py
+++ b/pyaccuwage/__init__.py
@@ -101,6 +101,9 @@ def json_dumps(records):
             if hasattr(o, 'toJSON') and isinstance(getattr(o, 'toJSON'), collections.Callable):
                 return o.toJSON()
 
+            if type(o) is bytes:
+                return o.decode('ascii')
+
             elif isinstance(o, decimal.Decimal):
                 return str(o.quantize(decimal.Decimal('0.01')))