diff --git a/test/module_tail.cpp b/test/module_tail.cpp
index ac885cf5..594949ef 100644
--- a/test/module_tail.cpp
+++ b/test/module_tail.cpp
@@ -38,7 +38,7 @@ struct test_failure : std::exception
 
     ~test_failure() throw() {}
     
-    char const* what() throw()
+    char const* what() const throw()
     {
         return boost::python::extract<char const*>(msg)();
     }