diff --git a/chassis/flask_nameko/proxies.py b/chassis/flask_nameko/proxies.py
index 825fd09..24931b2 100644
--- a/chassis/flask_nameko/proxies.py
+++ b/chassis/flask_nameko/proxies.py
@@ -65,11 +65,13 @@ class FlaskPooledClusterRpcProxy(PooledClusterRpcProxy):
         if app:
             self.init_app(app)
 
-    def init_app(self, app):
+    def init_app(self, app, extra_config=None):
         config = dict()
         for key, val in app.config.items():
             if key == 'NAMEKO_AMQP_URI':
                 config['uri'] = val
+        if isinstance(extra_config, dict):
+            config.update(extra_config)
         self.configure(config)
 
         self._connect_on_method_call = config.get(