diff --git a/src/nlsr_sm.hpp b/src/nlsr_sm.hpp
index 542203b..52ccbbd 100644
--- a/src/nlsr_sm.hpp
+++ b/src/nlsr_sm.hpp
@@ -5,6 +5,7 @@
 #include<string>
 #include <ndn-cpp-dev/face.hpp>
 
+namespace nlsr {
 
 using namespace std;
 
@@ -58,4 +59,6 @@
 	uint32_t corLsaSeq;
 };
 
+
+}//namespace nlsr
 #endif