diff --git a/include/chaiscript/dispatchkit/bootstrap.hpp b/include/chaiscript/dispatchkit/bootstrap.hpp
index 579b6ee..dd1f880 100644
--- a/include/chaiscript/dispatchkit/bootstrap.hpp
+++ b/include/chaiscript/dispatchkit/bootstrap.hpp
@@ -486,10 +486,10 @@ namespace chaiscript
         m->add(chaiscript::fun(&has_parse_tree), "has_parse_tree");
         m->add(chaiscript::fun(&get_parse_tree), "get_parse_tree");
 
-        m->add(chaiscript::user_type<chaiscript::exception::eval_error>("eval_error"));
+        m->add(chaiscript::user_type<chaiscript::exception::eval_error>(), "eval_error");
         m->add(chaiscript::base_class<std::runtime_error, chaiscript::exception::eval_error>());
 
-        m->add(chaiscript::user_type<chaiscript::exception::arithmetic_error>("arithmetic_error"));
+        m->add(chaiscript::user_type<chaiscript::exception::arithmetic_error>(), "arithmetic_error");
         m->add(chaiscript::base_class<std::runtime_error, chaiscript::exception::arithmetic_error>());
 
 
diff --git a/unittests/divide_by_zero_protection.chai b/unittests/divide_by_zero_protection.chai
new file mode 100644
index 0000000..ba40a43
--- /dev/null
+++ b/unittests/divide_by_zero_protection.chai
@@ -0,0 +1,7 @@
+try {
+  3/0
+  assert_true(false); // should never get here
+} catch (e) {
+  assert_equal("Arithmetic error: divide by zero", e.what())
+}
+