diff --git a/crow/include/crow/app.h b/crow/include/crow/app.h
index 7051ec8..c919245 100644
--- a/crow/include/crow/app.h
+++ b/crow/include/crow/app.h
@@ -57,9 +57,7 @@
         return router.newRuleDynamic(rule);
     }
 
-    template <uint64_t Tag>
-    auto route(std::string&& rule) -> typename std::result_of<
-        decltype (&Router::newRuleTagged<Tag>)(Router, std::string&&)>::type
+    template <uint64_t Tag> auto& route(std::string&& rule)
     {
         return router.newRuleTagged<Tag>(std::move(rule));
     }