diff --git a/include/boost/config/compiler/metrowerks.hpp b/include/boost/config/compiler/metrowerks.hpp
index 0bbb9f7b..68821cd5 100644
--- a/include/boost/config/compiler/metrowerks.hpp
+++ b/include/boost/config/compiler/metrowerks.hpp
@@ -26,6 +26,8 @@
 #   define BOOST_NO_INTRINSIC_WCHAR_T
 #endif
 
+#define BOOST_HAS_THREADS
+
 
 #define BOOST_COMPILER "Metrowerks CodeWarrior C++ version " BOOST_STRINGIZE(__MWERKS__)