diff --git a/src/c3nav/routing/router.py b/src/c3nav/routing/router.py
index 8c1cfd30..c33144a9 100644
--- a/src/c3nav/routing/router.py
+++ b/src/c3nav/routing/router.py
@@ -153,6 +153,8 @@ class BaseRouterProxy:
         return result
 
     def __getattr__(self, name):
+        if name == '__setstate__':
+            raise AttributeError
         return getattr(self.src, name)