1 files changed, 3 insertions, 2 deletions
diff --git a/crow/include/crow/routing.h b/crow/include/crow/routing.h
index d07f09f625..f1f3b32ce3 100644
--- a/crow/include/crow/routing.h
+++ b/crow/include/crow/routing.h
@@ -4,10 +4,11 @@
 #include <cstdint>
 #include <memory>
 #include <tuple>
-#include <unordered_map>
 #include <utility>
 #include <vector>
 
+#include "boost/container/flat_map.hpp"
+
 #include "crow/common.h"
 #include "crow/http_request.h"
 #include "crow/http_response.h"
@@ -502,7 +503,7 @@ class Trie {
   struct Node {
     unsigned rule_index{};
     std::array<unsigned, (int)ParamType::MAX> param_childrens{};
-    std::unordered_map<std::string, unsigned> children;
+    boost::container::flat_map<std::string, unsigned> children;
 
     bool IsSimpleNode() const {
       return !rule_index &&