diff --git a/testUpdateHostsFile.py b/testUpdateHostsFile.py
index 1fb72993b..17c6edcb6 100644
--- a/testUpdateHostsFile.py
+++ b/testUpdateHostsFile.py
@@ -64,7 +64,7 @@ class Base(unittest.TestCase):
     @property
     def sep(self):
         if platform.system().lower() == "windows":
-            return "\\"
+            return "/"
         return os.sep
 
     def assert_called_once(self, mock_method):