diff --git a/generator.v b/generator.v
index 18b1e6f..b9f0224 100644
--- a/generator.v
+++ b/generator.v
@@ -85,7 +85,10 @@ fn (mut g Generator) gen_class_print_func(stmt ClassDecl) {
 
 		if member.type != 'string' && g.symbols.lookup_class(member.type) != none {
       inner_struct_name := mangle_struct(member.type)
-      g.out.writeln('print_${inner_struct_name}(s.${member.name}, indent + 1);')
+      g.out.write_string('print_${inner_struct_name}(s.${member.name}, indent + 1);')
+			if member.is_immutable {
+  	  	g.out.write_string('printf(" (immutable)\\n");')
+			}
     } else {
       format := get_type_format(member.type)
       g.out.write_string('printf("%${format}')