diff --git a/example/test_thread_clock.cpp b/example/test_thread_clock.cpp
index 8eb78fc..2bc7610 100644
--- a/example/test_thread_clock.cpp
+++ b/example/test_thread_clock.cpp
@@ -11,11 +11,12 @@
 
 #include <iostream>
 
-using namespace boost::chrono;
 
 void test_thread_clock()
 {
 #if defined(BOOST_CHRONO_HAS_THREAD_CLOCK)
+  using namespace boost::chrono;
+
     std::cout << "thread_clock test" << std::endl;
     thread_clock::duration delay = milliseconds(5);
     thread_clock::time_point start = thread_clock::now();