1 files changed, 1 insertions, 3 deletions
diff --git a/src/cryptography/x509.py b/src/cryptography/x509.py
index a091cd78..afd28f20 100644
--- a/src/cryptography/x509.py
+++ b/src/cryptography/x509.py
@@ -1473,9 +1473,7 @@ class CertificateSigningRequestBuilder(object):
                 OID_SUBJECT_ALTERNATIVE_NAME, critical, extension
             )
         elif isinstance(extension, KeyUsage):
-            extension = Extension(
-                OID_KEY_USAGE, critical, extension
-            )
+            extension = Extension(OID_KEY_USAGE, critical, extension)
         else:
             raise NotImplementedError('Unsupported X.509 extension.')
         # TODO: This is quadratic in the number of extensions