Index: boost/python/detail/unwind_type.hpp
===================================================================
--- boost/python/detail/unwind_type.hpp	(revision 41530)
+++ boost/python/detail/unwind_type.hpp	(working copy)
@@ -149,7 +149,7 @@
 template <class Generator, class U>
 inline typename Generator::result_type
 #ifndef _MSC_VER
-unwind_type(boost::type<U>*p, Generator*)
+unwind_type(boost::type<U>*, Generator*)
 #else
 unwind_type(boost::type<U>*p =0, Generator* =0)
 #endif