diff --git a/src/wscript b/src/wscript
index e07188f5a..c0c5895ae 100644
--- a/src/wscript
+++ b/src/wscript
@@ -192,6 +192,9 @@ def ns3_python_bindings(bld):
     source = [bld.srcnode.find_resource('bindings/python/ns3modulegen-modular.py').relpath_gen(bld.path),
               "bindings/modulegen__%s.py" % apidefs]
 
+    if bindings_dir.find_resource("modulegen_customizations.py") is not None:
+        source.append("bindings/modulegen_customizations.py")
+
     # the local customization file may or not exist
     if bld.path.find_resource("bindings/modulegen_local.py"):
         source.append("bindings/modulegen_local.py")