diff --git a/data/c++.m4 b/data/c++.m4
index 6033e174..e1a0c1f0 100644
--- a/data/c++.m4
+++ b/data/c++.m4
@@ -28,7 +28,7 @@ b4_percent_define_default([[parser_class_name]], [[parser]])
 # Don't do that so that we remember whether we're using a user
 # request, or the default value.
 #
-# b4_percent_define_default([[location_type]], [[location_type]])
+# b4_percent_define_default([[location_type]], [[location]])
 
 b4_percent_define_default([[filename_type]], [[std::string]])
 b4_percent_define_default([[api.namespace]], m4_defn([b4_prefix]))