diff --git a/tests/test_flake8_profiles.py b/tests/test_flake8_profiles.py
index 5923cdb..96540c2 100644
--- a/tests/test_flake8_profiles.py
+++ b/tests/test_flake8_profiles.py
@@ -39,7 +39,10 @@ class NoProfileTestCase(CommandRunningTestCase):
     def test_no_profile(self):
         self.assertNotEqual(0, self.returncode)
         self.assertIn(
-            "The specified config file does not exist: config/notfound.conf",
+            (
+                f"The specified config file does not exist: config{os.sep}"
+                "notfound.conf"
+            ),
             self.stdout,
         )
 
@@ -50,7 +53,10 @@ class DefaultProfileTestCase(CommandRunningTestCase):
     env = {"FLAKE8_PROFILE_DIR": "config"}
 
     def test_default_profile_from_config(self):
-        self.assertIn("Loaded profile from config/default.conf", self.stderr)
+        self.assertIn(
+            f"Loaded profile from config{os.sep}default.conf",
+            self.stderr,
+        )
 
     def test_default_profile_finds_violations(self):
         self.assertNotEqual(0, self.returncode)
@@ -63,7 +69,10 @@ class ProfileFromCliTestCase(CommandRunningTestCase):
     env = {"FLAKE8_PROFILE_DIR": "config"}
 
     def test_profile_from_cli(self):
-        self.assertIn("Loaded profile from config/nodoc.conf", self.stderr)
+        self.assertIn(
+            f"Loaded profile from config{os.sep}nodoc.conf",
+            self.stderr,
+        )
 
     def test_nodoc_profile_finds_no_violations(self):
         self.assertEqual(0, self.returncode)