diff --git a/core/tests/exclude_test.py b/core/tests/exclude_test.py
index 8bfc8cc7..de5e46c5 100644
--- a/core/tests/exclude_test.py
+++ b/core/tests/exclude_test.py
@@ -11,6 +11,7 @@ from xml.etree import ElementTree as ET
 
 # from pytest import raises
 from hscommon.testutil import eq_
+from hscommon.plat import ISWINDOWS
 
 from .base import DupeGuru
 from ..exclude import ExcludeList, ExcludeDict, default_regexes, AlreadyThereException
@@ -246,7 +247,10 @@ class TestCaseCompiledList():
 
     def test_compiled_files(self):
         # is path separator checked properly to yield the output
-        regex1 = r"test/one/sub"
+        if ISWINDOWS:
+            regex1 = r"test\\one\\sub"
+        else:
+            regex1 = r"test/one/sub"
         self.e_separate.add(regex1)
         self.e_separate.mark(regex1)
         self.e_union.add(regex1)