diff --git a/tests/unit/signature-info.t.cpp b/tests/unit/signature-info.t.cpp
index d538217..8fc459c 100644
--- a/tests/unit/signature-info.t.cpp
+++ b/tests/unit/signature-info.t.cpp
@@ -25,8 +25,7 @@
 
 #include <boost/lexical_cast.hpp>
 
-namespace ndn {
-namespace tests {
+namespace ndn::tests {
 
 BOOST_CONCEPT_ASSERT((boost::EqualityComparable<SignatureInfo>));
 BOOST_CONCEPT_ASSERT((WireEncodable<SignatureInfo>));
@@ -550,5 +549,4 @@
 
 BOOST_AUTO_TEST_SUITE_END() // TestSignatureInfo
 
-} // namespace tests
-} // namespace ndn
+} // namespace ndn::tests