diff --git a/src/sync.h b/src/sync.h
index 68a944308..c9ba7f8b0 100644
--- a/src/sync.h
+++ b/src/sync.h
@@ -8,6 +8,7 @@
 
 #include "threadsafety.h"
 
+#undef __cpuid
 #include <boost/thread/condition_variable.hpp>
 #include <boost/thread/locks.hpp>
 #include <boost/thread/mutex.hpp>