diff --git a/routing/routing_callbacks.hpp b/routing/routing_callbacks.hpp
index 78cf0bccded..1c318282829 100644
--- a/routing/routing_callbacks.hpp
+++ b/routing/routing_callbacks.hpp
@@ -71,7 +71,7 @@ inline std::string DebugPrint(RouterResultCode code)
   case RouterResultCode::RouteNotFoundRedressRouteError: return "RouteNotFoundRedressRouteError";
   }
 
-  std::string const result = "Unknown RouterResultCode:" + std::to_string(static_cast<int>(code));
+  std::string const result = "Unknown RouterResultCode: " + std::to_string(static_cast<int>(code));
   ASSERT(false, (result));
   return result;
 }