diff --git a/test/cxx/MessagePassingTest.cpp b/test/cxx/MessagePassingTest.cpp
index 0f8ea7e922..0b15f4f98e 100644
--- a/test/cxx/MessagePassingTest.cpp
+++ b/test/cxx/MessagePassingTest.cpp
@@ -15,16 +15,16 @@ namespace tut {
 		}
 
 		void sendMessagesLater() {
-			std::cout << "sender: sleep 1" << std::endl;
+			std::cout << SystemTime::getMonotonicUsec() << " sender: sleep 1" << std::endl;
 			syscalls::usleep(20000);
-			std::cout << "sender: sending hi" << std::endl;
+			std::cout << SystemTime::getMonotonicUsec() << " sender: sending hi" << std::endl;
 			box->send("hi");
-			std::cout << "sender: sent hi" << std::endl;
-			std::cout << "sender: sleep 2" << std::endl;
+			std::cout << SystemTime::getMonotonicUsec() << " sender: sent hi" << std::endl;
+			std::cout << SystemTime::getMonotonicUsec() << " sender: sleep 2" << std::endl;
 			syscalls::usleep(20000);
-			std::cout << "sender: sending ho" << std::endl;
+			std::cout << SystemTime::getMonotonicUsec() << " sender: sending ho" << std::endl;
 			box->send("ho");
-			std::cout << "sender: sent ho" << std::endl;
+			std::cout << SystemTime::getMonotonicUsec() << " sender: sent ho" << std::endl;
 		}
 	};
 
@@ -77,7 +77,7 @@ namespace tut {
 		unsigned long long timeoutUSec = 200000;
 		Timer<> timer;
 		auto m = box->recv("ho", &timeoutUSec);
-		std::cout << "Done receiving" << std::endl;
+		std::cout << SystemTime::getMonotonicUsec() << " Done receiving" << std::endl;
 		if (m == nullptr) {
 			std::cout << "Timeout" << std::endl;
 			abort();