diff --git a/DDTest/python/test_import_ddg4.py b/DDTest/python/test_import_ddg4.py
index 7c6a6b8e4dfa92fb0d19ab34e182307b67ac51e5..3626c707fa2fc740b717fe4cf3330db0f3335312 100644
--- a/DDTest/python/test_import_ddg4.py
+++ b/DDTest/python/test_import_ddg4.py
@@ -9,4 +9,4 @@ from test_import import test_module
 
 
 def test_module_ddg4():
-    test_module('DDG4')
+    test_module(str('DDG4'))