diff --git a/jwt_proxy/api.py b/jwt_proxy/api.py
index 803ef95..a52e357 100644
--- a/jwt_proxy/api.py
+++ b/jwt_proxy/api.py
@@ -1,4 +1,4 @@
-from flask import Blueprint, abort, current_app, jsonify, request, json as flask_json
+from flask import Blueprint, abort, current_app, jsonify, request
 import jwt
 import requests
 import json
@@ -11,13 +11,9 @@
 
 # Workaround no JSON representation for datetime.timedelta
 class CustomJSONProvider(DefaultJSONProvider):
-    def __init__(self, app):
-        print("Initialized the provider")
-        super().__init__(app)
-
-    def default(self, o):
-        print("Using default")
-        return str(o)
+    @staticmethod
+    def default(obj):
+        return str(obj)
 
 
 def proxy_request(req, upstream_url, user_info=None):