diff --git a/tests/rest/client/v2_alpha/test_register.py b/tests/rest/client/v2_alpha/test_register.py
index 66fd25964d..f9a2b22485 100644
--- a/tests/rest/client/v2_alpha/test_register.py
+++ b/tests/rest/client/v2_alpha/test_register.py
@@ -13,6 +13,7 @@ class RegisterRestServletTestCase(unittest.TestCase):
         self.request_data = ""
         self.request = Mock(
             content=Mock(read=Mock(side_effect=lambda: self.request_data)),
+            path='/_matrix/api/v2_alpha/register'
         )
         self.request.args = {}
 
@@ -131,4 +132,4 @@ class RegisterRestServletTestCase(unittest.TestCase):
         })
         self.registration_handler.register = Mock(return_value=("@user:id", "t"))
         d = self.servlet.on_POST(self.request)
-        return self.assertFailure(d, SynapseError)
\ No newline at end of file
+        return self.assertFailure(d, SynapseError)