diff --git a/tools/sdbusplus/templates/method.mako.prototype.hpp b/tools/sdbusplus/templates/method.mako.prototype.hpp
index 7d295eb..1d3cbfb 100644
--- a/tools/sdbusplus/templates/method.mako.prototype.hpp
+++ b/tools/sdbusplus/templates/method.mako.prototype.hpp
@@ -181,7 +181,7 @@
                 ${ parameters_types_as_list() }>());
     % endif
 static const auto _return_${ method.CamelCase } =
-    % if len(method.parameters) == 0:
+    % if len(method.returns) == 0:
         utility::tuple_to_array(std::make_tuple('\0'));
     % else:
         utility::tuple_to_array(message::types::type_id<