diff --git a/src/Trie.hpp b/src/Trie.hpp
index b06e721..4e5754a 100644
--- a/src/Trie.hpp
+++ b/src/Trie.hpp
@@ -25,7 +25,7 @@ namespace CppJieba
     const double MIN_DOUBLE = -3.14e+100;
     const double MAX_DOUBLE = 3.14e+100;
     const size_t DICT_COLUMN_NUM = 3;
-    typedef unordered_map<uint16_t, struct TrieNode*> TrieNodeMap;
+    typedef map<uint16_t, struct TrieNode*> TrieNodeMap;
     struct TrieNode
     {
         TrieNodeMap hmap;