diff --git a/test/sync/conditions/condition_variable/wait_for_pred_pass.cpp b/test/sync/conditions/condition_variable/wait_for_pred_pass.cpp
index 8b03f35c..bfc5555f 100644
--- a/test/sync/conditions/condition_variable/wait_for_pred_pass.cpp
+++ b/test/sync/conditions/condition_variable/wait_for_pred_pass.cpp
@@ -21,6 +21,7 @@
 #include <boost/thread/mutex.hpp>
 #include <boost/thread/thread.hpp>
 #include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
 #include <cassert>
 #include <iostream>
 #include "../../../timming.hpp"
@@ -64,9 +65,9 @@ void f()
     assert(test2 == 0);
     test1 = 1;
     cv.notify_one();
-    Clock::time_point t0 = Clock::now();
+    BOOST_ATTRIBUTE_UNUSED Clock::time_point t0 = Clock::now();
     cv.wait_for(lk, milliseconds(250), Pred(test2));
-    Clock::time_point t1 = Clock::now();
+    BOOST_ATTRIBUTE_UNUSED Clock::time_point t1 = Clock::now();
     if (runs == 0)
     {
       assert(t1 - t0 < max_diff);
diff --git a/test/sync/conditions/condition_variable/wait_until_pred_pass.cpp b/test/sync/conditions/condition_variable/wait_until_pred_pass.cpp
index f4441ea4..a0eee6a6 100644
--- a/test/sync/conditions/condition_variable/wait_until_pred_pass.cpp
+++ b/test/sync/conditions/condition_variable/wait_until_pred_pass.cpp
@@ -21,6 +21,7 @@
 #include <boost/thread/mutex.hpp>
 #include <boost/thread/thread.hpp>
 #include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
 #include <cassert>
 #include <iostream>
 #include "../../../timming.hpp"
@@ -79,7 +80,7 @@ void f()
     cv.notify_one();
     Clock::time_point t0 = Clock::now();
     Clock::time_point t = t0 + Clock::duration(250);
-    bool r = cv.wait_until(lk, t, Pred(test2));
+    BOOST_ATTRIBUTE_UNUSED bool r = cv.wait_until(lk, t, Pred(test2));
     Clock::time_point t1 = Clock::now();
     if (runs == 0)
     {