diff --git a/src/nlsr_tokenizer.hpp b/src/nlsr_tokenizer.hpp
index 9363462..1f09cac 100644
--- a/src/nlsr_tokenizer.hpp
+++ b/src/nlsr_tokenizer.hpp
@@ -8,6 +8,8 @@
 #include <list>
 #include <ndn-cpp-dev/face.hpp>
 
+namespace nlsr {
+
 using namespace std;
 using namespace boost;
 
@@ -56,4 +58,5 @@
 		std::list<string> tokenList;
 };
 
+}//namespace nlsr
 #endif