diff --git a/libsearch/searchinterface/searchtasks/file-content-search-task.cpp b/libsearch/searchinterface/searchtasks/file-content-search-task.cpp
index 3292c9e..2c94abb 100644
--- a/libsearch/searchinterface/searchtasks/file-content-search-task.cpp
+++ b/libsearch/searchinterface/searchtasks/file-content-search-task.cpp
@@ -210,7 +210,7 @@ inline Xapian::Query FileContentSearchWorker::createQuery()
 {
     std::vector<Xapian::Query> v;
 
-    for (const auto &keyword : m_searchController->getKeyword()) {
+    for (auto &keyword : m_searchController->getKeyword()) {
         std::vector<KeyWord> sKeyWord = ChineseSegmentation::getInstance()->callSegment(keyword);
 
         for(const auto & c : sKeyWord) {