diff --git a/bindings/python/ns3modulegen-modular.py b/bindings/python/ns3modulegen-modular.py
index 9547e287a..2f5f178d1 100644
--- a/bindings/python/ns3modulegen-modular.py
+++ b/bindings/python/ns3modulegen-modular.py
@@ -73,6 +73,8 @@ def main(argv):
     root_module.set_name(extension_name)
     root_module.add_include('"ns3/%s-module.h"' % module_name)
 
+    ns3modulegen_core_customizations.add_std_ios_openmode(root_module)
+
     # -----------
     module_apidefs.register_types(root_module)
 
diff --git a/bindings/python/ns3modulegen_core_customizations.py b/bindings/python/ns3modulegen_core_customizations.py
index 419441fd7..218cae556 100644
--- a/bindings/python/ns3modulegen_core_customizations.py
+++ b/bindings/python/ns3modulegen_core_customizations.py
@@ -418,7 +418,11 @@ def add_std_ofstream(module):
     ofstream.add_constructor([Parameter.new("const char *", 'filename'),
                               Parameter.new("::std::ofstream::openmode", 'mode', default_value="std::ios_base::out")])
     ofstream.add_method('close', None, [])
+    
+    add_std_ios_openmode(module)
 
+
+def add_std_ios_openmode(module):
     import pybindgen.typehandlers.base
     for alias in "std::_Ios_Openmode", "std::ios::openmode":
         pybindgen.typehandlers.base.param_type_matcher.add_type_alias(alias, "int")