diff --git a/playhouse/postgres_ext.py b/playhouse/postgres_ext.py
index 0bb974229..f2cdf590d 100644
--- a/playhouse/postgres_ext.py
+++ b/playhouse/postgres_ext.py
@@ -299,8 +299,6 @@ class JSONField(Field):
     _json_datatype = 'json'
 
     def __init__(self, dumps=None, *args, **kwargs):
-        if Json is None:
-            raise Exception('Your version of psycopg2 does not support JSON.')
         self.dumps = dumps or json.dumps
         super(JSONField, self).__init__(*args, **kwargs)