diff --git boost/exception/detail/clone_current_exception.hpp boost/exception/detail/clone_current_exception.hpp
index cc201b9..b485fee 100644
--- boost/exception/detail/clone_current_exception.hpp
+++ boost/exception/detail/clone_current_exception.hpp
@@ -38,6 +38,7 @@ boost
 #ifdef BOOST_ENABLE_NON_INTRUSIVE_EXCEPTION_PTR
             return clone_current_exception_non_intrusive(cloned);
 #else
+            (void)cloned;
             return clone_current_exception_result::not_supported;
 #endif
             }