diff --git a/tests/httpx2/client/test_client.py b/tests/httpx2/client/test_client.py
index 7ad44a3f..96730e5b 100644
--- a/tests/httpx2/client/test_client.py
+++ b/tests/httpx2/client/test_client.py
@@ -429,7 +429,10 @@ def cp1252_but_no_content_type(request: httpx2.Request) -> httpx2.Response:
 
         assert response.status_code == 200
         assert response.reason_phrase == "OK"
-        assert response.encoding == "ISO-8859-1"
+        # The encoded byte string is consistent with either ISO-8859-1 or
+        # WINDOWS-1252. Versions <6.0 of chardet claim the former, while
+        # chardet 6.0 detects the latter.
+        assert response.encoding in ("ISO-8859-1", "WINDOWS-1252")
         assert response.text == text
 
 
@@ -456,5 +459,8 @@ def cp1252_but_no_content_type(request: httpx2.Request) -> httpx2.Response:
 
         assert response.status_code == 200
         assert response.reason_phrase == "OK"
-        assert response.encoding == "ISO-8859-1"
+        # The encoded byte string is consistent with either ISO-8859-1 or
+        # WINDOWS-1252. Versions <6.0 of chardet claim the former, while
+        # chardet 6.0 detects the latter.
+        assert response.encoding in ("ISO-8859-1", "WINDOWS-1252")
         assert response.text == text