diff --git a/selftest/subunithelper.py b/selftest/subunithelper.py
index 872989e088e..13b0580ebfa 100644
--- a/selftest/subunithelper.py
+++ b/selftest/subunithelper.py
@@ -552,6 +552,3 @@ class PlainFormatter(TestsuiteEnabledTestResult):
         self.skips.setdefault(reason, []).append(name)
         if self.totalsuites:
             self.totalsuites-=1
-
-
-class TestProtocolServer(subunit.TestProtocolServer):