diff --git a/build/vc100/turtle.vcxproj b/build/vc100/turtle.vcxproj
index 5147023..ca41443 100644
--- a/build/vc100/turtle.vcxproj
+++ b/build/vc100/turtle.vcxproj
@@ -48,6 +48,7 @@
     <ClInclude Include="..\..\turtle\detail\type_name.hpp" />
     <ClInclude Include="..\..\turtle\detail\verifiable.hpp" />
     <ClInclude Include="..\..\turtle\error.hpp" />
+    <ClInclude Include="..\..\turtle\exception.hpp" />
     <ClInclude Include="..\..\turtle\format.hpp" />
     <ClInclude Include="..\..\turtle\log.hpp" />
     <ClInclude Include="..\..\turtle\matcher.hpp" />
diff --git a/build/vc100/turtle.vcxproj.filters b/build/vc100/turtle.vcxproj.filters
index 05804aa..027d606 100644
--- a/build/vc100/turtle.vcxproj.filters
+++ b/build/vc100/turtle.vcxproj.filters
@@ -124,5 +124,8 @@
     <ClInclude Include="..\..\turtle\detail\matcher_base.hpp">
       <Filter>Source Files\detail</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\turtle\exception.hpp">
+      <Filter>Source Files</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/turtle/error.hpp b/turtle/error.hpp
index e7e6fa6..11a6aa6 100644
--- a/turtle/error.hpp
+++ b/turtle/error.hpp
@@ -10,18 +10,15 @@
 #define MOCK_ERROR_HPP_INCLUDED
 
 #include "config.hpp"
+#include "exception.hpp"
 #ifdef MOCK_USE_BOOST_TEST
 #include <boost/test/framework.hpp>
 #include <boost/test/test_tools.hpp>
 #include <boost/test/unit_test_suite.hpp>
-#include <boost/test/execution_monitor.hpp>
 #include <boost/exception/enable_current_exception.hpp>
 
 namespace mock
 {
-    struct exception : virtual boost::execution_aborted
-    {};
-
     template< typename Result >
     struct error
     {
diff --git a/turtle/exception.hpp b/turtle/exception.hpp
new file mode 100644
index 0000000..16e5aaa
--- /dev/null
+++ b/turtle/exception.hpp
@@ -0,0 +1,24 @@
+// http://turtle.sourceforge.net
+//
+// Copyright Mathieu Champlon 2012
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef MOCK_EXCEPTION_HPP_INCLUDED
+#define MOCK_EXCEPTION_HPP_INCLUDED
+
+#include "config.hpp"
+#ifdef MOCK_USE_BOOST_TEST
+#include <boost/test/execution_monitor.hpp>
+
+namespace mock
+{
+    struct exception : virtual boost::execution_aborted
+    {};
+} // mock
+
+#endif // MOCK_USE_BOOST_TEST
+
+#endif // MOCK_EXCEPTION_HPP_INCLUDED