diff --git a/tests/hazmat/primitives/test_ec.py b/tests/hazmat/primitives/test_ec.py
index e6a9146..6aea58a 100644
--- a/tests/hazmat/primitives/test_ec.py
+++ b/tests/hazmat/primitives/test_ec.py
@@ -71,7 +71,6 @@
     algorithm = None
 
 
-@utils.register_interface(EllipticCurveBackend)
 class DeprecatedDummyECBackend(object):
     def elliptic_curve_private_key_from_numbers(self, numbers):
         return b"private_key"