diff --git a/tgext/debugbar/sections/sqla.py b/tgext/debugbar/sections/sqla.py
index 5096f4f..af330ae 100644
--- a/tgext/debugbar/sections/sqla.py
+++ b/tgext/debugbar/sections/sqla.py
@@ -19,7 +19,7 @@ def default(self, obj):
             return str(obj)
         else:
             return json.JSONEncoder.default(self, obj)
-json_encoder = ExtendedJSONEncoder()
+json_encoder = lambda x: json.dumps(x, cls=ExtendedJSONEncoder)
 
 import tg
 from tg import config, request, app_globals
@@ -89,6 +89,9 @@ def title(self):
         return _('SQLAlchemy')
 
     def _gather_queries(self):
+        if "sqlalchemy.json_serializer" in config:
+            json_encoder = config["sqlalchemy.json_serializer"]
+
         queries = getattr(request, 'tgdb_sqla_queries', [])
         if not queries:
             return []
@@ -98,7 +101,7 @@ def _gather_queries(self):
             is_select = query['statement'].strip().lower().startswith('select')
             params = ''
             try:
-                params = json_encoder.encode(query['parameters'])
+                params = json_encoder(query['parameters'])
             except TypeError:
                 return 'Unable to serialize parameters of the query'