diff --git a/src/nlsr_tokenizer.cpp b/src/nlsr_tokenizer.cpp
index e03d2d2..cf655ba 100644
--- a/src/nlsr_tokenizer.cpp
+++ b/src/nlsr_tokenizer.cpp
@@ -6,6 +6,8 @@
 
 #include "nlsr_tokenizer.hpp"
 
+namespace nlsr {
+
 using namespace std;
 using namespace boost;
 
@@ -114,3 +116,5 @@
 
 	return false;
 }
+
+}//namespace nlsr