diff --git a/src/nlsr_test.hpp b/src/nlsr_test.hpp
index c08fd30..17381a8 100644
--- a/src/nlsr_test.hpp
+++ b/src/nlsr_test.hpp
@@ -10,6 +10,8 @@
 #include "nlsr_npl.hpp"
 #include "nlsr_adjacent.hpp"
 
+namespace nlsr {
+
 using namespace std;
 
 class Nlsr;
@@ -31,4 +33,5 @@
 
 };
 
+} //namespace nlsr
 #endif