diff --git a/tests/management/test-nrd.cpp b/tests/management/test-nrd.cpp
index de95ee2..92622f0 100644
--- a/tests/management/test-nrd.cpp
+++ b/tests/management/test-nrd.cpp
@@ -39,7 +39,7 @@
   std::ostringstream os;
   os << opt;
   BOOST_CHECK_EQUAL(os.str(), "PrefixRegOptions(Prefix: /localhost/reg/test, "
-                    "FaceID: 0, Flags: 1, Cost: 0, ExpirationPeriod: -1, Protocol: )");
+                    "FaceID: 0, Flags: 1, Cost: 0, ExpirationPeriod: -9223372036854775808 milliseconds, Protocol: )");
 }
 
 BOOST_AUTO_TEST_CASE (PrefixRegOptionsDecoding)