diff --git a/src/nlsr_sm.cpp b/src/nlsr_sm.cpp
index 1744897..9de1b1a 100644
--- a/src/nlsr_sm.cpp
+++ b/src/nlsr_sm.cpp
@@ -2,8 +2,12 @@
 #include <iostream>
 #include "nlsr_sm.hpp"
 
+namespace nlsr {
+
 using namespace std;
 
 class Nlsr;
 
+}//namespace nlsr
+