diff --git a/src/nlsr_im.hpp b/src/nlsr_im.hpp
index 5e2f6c4..6c09eb0 100644
--- a/src/nlsr_im.hpp
+++ b/src/nlsr_im.hpp
@@ -5,6 +5,7 @@
 #include <ndn-cpp-dev/security/key-chain.hpp>
 #include <ndn-cpp-dev/util/scheduler.hpp>
 
+namespace nlsr {
 
 using namespace ndn;
 using namespace std;
@@ -33,5 +34,6 @@
 
 };
 
+}//namespace nlsr
 
 #endif