diff --git a/src/nlsr_nhl.hpp b/src/nlsr_nhl.hpp
index 0d381f5..9055b50 100644
--- a/src/nlsr_nhl.hpp
+++ b/src/nlsr_nhl.hpp
@@ -8,6 +8,8 @@
 
 #include "nlsr_nexthop.hpp"
 
+namespace nlsr {
+
 using namespace std;
 
 class Nhl
@@ -46,4 +48,6 @@
 ostream&
 operator<<(ostream& os, Nhl& nhl);
 
+}//namespace nlsr
+
 #endif