diff --git a/tests/test-encode-decode-block.cpp b/tests/test-encode-decode-block.cpp
index 301f9c3..fe433a4 100644
--- a/tests/test-encode-decode-block.cpp
+++ b/tests/test-encode-decode-block.cpp
@@ -9,7 +9,8 @@
 #include "interest.hpp"
 
 using namespace std;
-using namespace ndn;
+
+namespace ndn {
 
 BOOST_AUTO_TEST_SUITE(TestBlock)
 
@@ -64,3 +65,5 @@
 }
 
 BOOST_AUTO_TEST_SUITE_END()
+
+} // namespace ndn