diff --git a/src/nlsr_npl.hpp b/src/nlsr_npl.hpp
index 3a0393a..47bb8f5 100644
--- a/src/nlsr_npl.hpp
+++ b/src/nlsr_npl.hpp
@@ -5,6 +5,8 @@
 #include<string>
 #include <ndn-cpp-dev/face.hpp>
 
+namespace nlsr {
+
 using namespace std;
 
 class Npl{
@@ -31,4 +33,6 @@
 
 };
 
+}//namespace nlsr
+
 #endif