diff --git a/asyncssh/crypto/__init__.py b/asyncssh/crypto/__init__.py
index ef6c8e5..5d145da 100644
--- a/asyncssh/crypto/__init__.py
+++ b/asyncssh/crypto/__init__.py
@@ -57,5 +57,5 @@
 try:
     from .x509 import X509Certificate, X509Name, X509NamePattern
     from .x509 import generate_x509_certificate, import_x509_certificate
-except ImportError: # pragma: no cover
+except (ImportError, AttributeError): # pragma: no cover
     pass