diff --git a/src/option_types.hh b/src/option_types.hh
index 01d7ea3b..0433d4d9 100644
--- a/src/option_types.hh
+++ b/src/option_types.hh
@@ -197,7 +197,7 @@ void option_from_string(StringView str, std::tuple<Types...>& opt)
     if (elems.size() != sizeof...(Types))
         throw runtime_error(elems.size() < sizeof...(Types) ?
                               "not enough elements in tuple"
-                            : "to many elements in tuple");
+                            : "too many elements in tuple");
     TupleOptionDetail<sizeof...(Types)-1, Types...>::from_string(elems, opt);
 }