diff --git a/tests/utils.py b/tests/utils.py
index 3b5c33591..eb035cf48 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -114,6 +114,8 @@ class MockHttpResource(HttpServer):
         mock_request.method = http_method
         mock_request.uri = path
 
+        mock_request.getClientIP.return_value = "-"
+
         mock_request.requestHeaders.getRawHeaders.return_value=[
             "X-Matrix origin=test,key=,sig="
         ]