diff --git a/test/unittests/test_cpu_time.cpp b/test/unittests/test_cpu_time.cpp
index 32819bf5..bc80f8ae 100644
--- a/test/unittests/test_cpu_time.cpp
+++ b/test/unittests/test_cpu_time.cpp
@@ -112,6 +112,7 @@ namespace unittests
         {
             d += gen();
         }
+        (void)d;
     }