typo fix
diff --git a/tests/hazmat/bindings/test_openssl.py b/tests/hazmat/bindings/test_openssl.py
index fcd54dd..af9be35 100644
--- a/tests/hazmat/bindings/test_openssl.py
+++ b/tests/hazmat/bindings/test_openssl.py
@@ -44,7 +44,7 @@
         with pytest.raises(ValueError):
             backend.ciphers.register_cipher_adapter(AES, CBC, None)
 
-    def test_nonexistant_cipher(self):
+    def test_nonexistent_cipher(self):
         b = Backend()
         # TODO: this test assumes that 3DES-ECB doesn't exist
         b.ciphers.register_cipher_adapter(