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-rw-r--r--src/cryptography/hazmat/backends/openssl/backend.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/cryptography/hazmat/backends/openssl/backend.py b/src/cryptography/hazmat/backends/openssl/backend.py
index 80b73f42..69a8d87e 100644
--- a/src/cryptography/hazmat/backends/openssl/backend.py
+++ b/src/cryptography/hazmat/backends/openssl/backend.py
@@ -1047,7 +1047,7 @@ class Backend(object):
elif isinstance(extension.value, x509.SubjectAlternativeName):
pp, r = _encode_subject_alt_name(self, extension.value)
else:
- raise ValueError('Extension not yet supported.')
+ raise NotImplementedError('Extension not yet supported.')
obj = _txt2obj(self, extension.oid.dotted_string)
extension = self._lib.X509_EXTENSION_create_by_OBJ(