Index: Twisted-20.3.0/src/twisted/conch/test/test_ckeygen.py
===================================================================
--- Twisted-20.3.0.orig/src/twisted/conch/test/test_ckeygen.py
+++ Twisted-20.3.0/src/twisted/conch/test/test_ckeygen.py
@@ -66,7 +66,7 @@ class KeyGenTests(TestCase):
 
     def _testrun(self, keyType, keySize=None, privateKeySubtype=None):
         filename = self.mktemp()
-        args = ['ckeygen', '-t', keyType, '-f', filename, '--no-passphrase']
+        args = ['ckeygen-' + sys.version[:3], '-t', keyType, '-f', filename, '--no-passphrase']
         if keySize is not None:
             args.extend(['-b', keySize])
         if privateKeySubtype is not None:
@@ -100,7 +100,7 @@ class KeyGenTests(TestCase):
     def test_runBadKeytype(self):
         filename = self.mktemp()
         with self.assertRaises(subprocess.CalledProcessError):
-            subprocess.check_call(['ckeygen', '-t', 'foo', '-f', filename])
+            subprocess.check_call(['ckeygen-' + sys.version[:3], '-t', 'foo', '-f', filename])