diff --git a/src/nlsr_lsdb.hpp b/src/nlsr_lsdb.hpp
index d04acd7..24b489d 100644
--- a/src/nlsr_lsdb.hpp
+++ b/src/nlsr_lsdb.hpp
@@ -4,6 +4,8 @@
 #include <utility>
 #include "nlsr_lsa.hpp"
 
+namespace nlsr {
+
 using namespace std;
 
 class Nlsr;
@@ -78,4 +80,6 @@
 
 };
 
+}//namespace nlsr
+
 #endif