--- a/tests/test.py	Sun Oct 29 10:17:22 2023 +0100
+++ b/tests/test.py	Sun Oct 29 11:32:56 2023 +0100
@@ -2451,25 +2451,27 @@
         self.assertEqual(u("PRE_VALUE FOR KEY-1_POST"), y)
 
     def test_nested_filter_normpath(self):
+        p1 = u(os.path.join("a", "b", "c"))
         cfg1 = {
-            u("path1"): u("a\\b\\c"),
+            u("path1"): p1,
             u("path2"): u("{{|{{path1}}/../d|normpath|}}")
         }
         cfg = cfg = configmix.config.Configuration(cfg1)
         np = cfg.getvarl_s(u("path2"))
         self.assertEqual(
-            os.path.normpath(u("a/b/d")),
+            os.path.normpath(u(os.path.join("a", "b", "d"))),
             np)
 
     def test_nested_filter_normpath_posixpath(self):
+        p1 = u(os.path.join("a", "b", "c"))
         cfg1 = {
-            u("path1"): u("a\\b\\c"),
+            u("path1"): p1,
             u("path2"): u("{{|{{path1}}/../d|normpath,posixpath|}}")
         }
         cfg = cfg = configmix.config.Configuration(cfg1)
         np = cfg.getvarl_s(u("path2"))
         self.assertEqual(
-            u("a/b/d"),
+            u(os.path.join("a", "b", "d")),
             np)