diff --git a/turtle/mock.hpp b/turtle/mock.hpp
index b7aab3e..5a85907 100644
--- a/turtle/mock.hpp
+++ b/turtle/mock.hpp
@@ -24,13 +24,12 @@
 #include <boost/utility/identity_type.hpp>
 #include <boost/mpl/assert.hpp>
 
-#define MOCK_FUNCTION_TYPE(S, tpn) \
-    BOOST_DEDUCED_TYPENAME boost::remove_pointer< \
-        tpn BOOST_IDENTITY_TYPE((S)) >::type
-
 #define MOCK_CLASS(T) \
     struct T : mock::object
 
+#define MOCK_FUNCTION_TYPE(S, tpn) \
+    tpn boost::remove_pointer< tpn BOOST_IDENTITY_TYPE((S)) >::type
+
 #ifdef BOOST_NO_VARIADIC_MACROS
 
 #define MOCK_BASE_CLASS(T, I) \