diff --git a/examples/codegen/econf/spec.ini b/examples/codegen/econf/spec.ini
index aa36db235c2..d02ab8b81d5 100644
--- a/examples/codegen/econf/spec.ini
+++ b/examples/codegen/econf/spec.ini
@@ -7,6 +7,7 @@ default = 0
 
 [format/#]
 type = struct
+check/type = any
 default = ""
 gen/struct/type = FormatConf
 gen/struct/depth = 2
diff --git a/examples/codegen/tree/spec.ini b/examples/codegen/tree/spec.ini
index 10ca9c3ea23..f5ae6b31d14 100644
--- a/examples/codegen/tree/spec.ini
+++ b/examples/codegen/tree/spec.ini
@@ -3,18 +3,21 @@ mountpoint = codegen_tree_example.conf
 
 [root]
 type = struct_ref
+check/type = any
 default = ""
 check/reference = recursive
 check/reference/restrict = ../tree/_
 
 [tree/_]
 type = struct
+check/type = any
 default = ""
 gen/struct/type = Tree
 gen/struct/alloc = 1
 
 [tree/_/children/#]
 type = struct_ref
+check/type = any
 default = ""
 gen/struct/array/sizefield = childCount