diff --git a/test/mitmproxy/net/dns/test_response_codes.py b/test/mitmproxy/net/dns/test_response_codes.py
index 1392a881c..c90bec3f7 100644
--- a/test/mitmproxy/net/dns/test_response_codes.py
+++ b/test/mitmproxy/net/dns/test_response_codes.py
@@ -5,3 +5,4 @@ def test_simple():
     assert response_codes.NOERROR == 0
     assert response_codes.str(response_codes.NOERROR) == "NOERROR"
     assert response_codes.str(100) == "RCODE(100)"
+    assert response_codes.http_equiv_status_code(response_codes.NOERROR) == 200