diff --git a/test/SmartPtr/strong.cpp b/test/SmartPtr/strong.cpp
index 66cf4a4..3b2c0a6 100644
--- a/test/SmartPtr/strong.cpp
+++ b/test/SmartPtr/strong.cpp
@@ -15,6 +15,10 @@
 
 // ----------------------------------------------------------------------------
 
+#ifndef LOKI_CLASS_LEVEL_THREADING
+#define LOKI_CLASS_LEVEL_THREADING
+#endif
+
 #include <loki/StrongPtr.h>
 
 #include <iostream>