diff --git a/scripts/mk_util.py b/scripts/mk_util.py
index 19331ee50..01d594adf 100644
--- a/scripts/mk_util.py
+++ b/scripts/mk_util.py
@@ -1487,6 +1487,8 @@ def def_module_params(module_name, export, params, class_name=None, description=
     hpp = os.path.join(dirname, '%s.hpp' % class_name)
     out = open(hpp, 'w')
     out.write('// Automatically generated file\n')
+    out.write('#ifndef __%s_HPP_\n' % class_name.upper())
+    out.write('#define __%s_HPP_\n' % class_name.upper())
     out.write('#include"params.h"\n')
     if export:
         out.write('#include"gparams.h"\n')
@@ -1518,6 +1520,7 @@ def def_module_params(module_name, export, params, class_name=None, description=
             out.write('  %s %s() const { return p.%s("%s", %s); }\n' % 
                       (TYPE2CTYPE[param[1]], to_c_method(param[0]), TYPE2GETTER[param[1]], param[0], pyg_default_as_c_literal(param)))
     out.write('};\n')
+    out.write('#endif\n')
     if is_verbose():
         print "Generated '%s'" % hpp