diff --git a/src/QuerySegment.hpp b/src/QuerySegment.hpp
index 9efd6d9..617d4f2 100644
--- a/src/QuerySegment.hpp
+++ b/src/QuerySegment.hpp
@@ -16,8 +16,7 @@
 namespace CppJieba {
 class QuerySegment: public SegmentBase {
  public:
-  QuerySegment(const string& dict, const string& model, size_t maxWordLen = 4, 
-        const string& userDict = "")
+  QuerySegment(const string& dict, const string& model, const string& userDict = "", size_t maxWordLen = 4)
     : mixSeg_(dict, model, userDict),
       fullSeg_(mixSeg_.getDictTrie()),
       maxWordLen_(maxWordLen) {
diff --git a/test/unittest/TSegments.cpp b/test/unittest/TSegments.cpp
index f557a0b..e5a7431 100644
--- a/test/unittest/TSegments.cpp
+++ b/test/unittest/TSegments.cpp
@@ -162,7 +162,7 @@ TEST(FullSegment, Test1) {
 }
 
 TEST(QuerySegment, Test1) {
-  QuerySegment segment("../dict/extra_dict/jieba.dict.small.utf8", "../dict/hmm_model.utf8", 3);
+  QuerySegment segment("../dict/extra_dict/jieba.dict.small.utf8", "../dict/hmm_model.utf8", "", 3);
   const char* str = "小明硕士毕业于中国科学院计算所，后在日本京都大学深造";
   vector<string> words;
 
@@ -176,7 +176,7 @@ TEST(QuerySegment, Test1) {
 }
 
 TEST(QuerySegment, Test2) {
-  QuerySegment segment("../dict/extra_dict/jieba.dict.small.utf8", "../dict/hmm_model.utf8", 3, "../test/testdata/userdict.utf8");
+  QuerySegment segment("../dict/extra_dict/jieba.dict.small.utf8", "../dict/hmm_model.utf8", "../test/testdata/userdict.utf8", 3);
 
   {
     const char* str = "小明硕士毕业于中国科学院计算所，后在日本京都大学深造";