diff --git a/src/usinstances.cpp b/src/usinstances.cpp
index 35400006..7546c621 100644
--- a/src/usinstances.cpp
+++ b/src/usinstances.cpp
@@ -24,6 +24,7 @@
 #define BOOST_REGEX_US_INSTANTIATE
 
 #ifdef _DLL_CPPLIB
+#include <boost/detail/workaround.hpp>
 //
 // This is a horrible workaround, without declaring these symbols extern we get
 // duplicate symbol errors when linking if the application is built without
@@ -45,7 +46,9 @@ template _CRTIMP2 bool __cdecl operator<(
 template _CRTIMP2 bool __cdecl operator>(
    const basic_string<unsigned short, char_traits<unsigned short>, allocator<unsigned short> >&,
    const basic_string<unsigned short, char_traits<unsigned short>, allocator<unsigned short> >&);
+#if BOOST_WORKAROUND(BOOST_MSVC, > 1300) && BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1400)
 template<> _CRTIMP2 std::size_t __cdecl char_traits<unsigned short>::length(unsigned short const*);
+#endif
 }
 #endif