diff --git a/src/cryptography/hazmat/backends/openssl/x509.py b/src/cryptography/hazmat/backends/openssl/x509.py
index 1c0c3ac..2572cc4 100644
--- a/src/cryptography/hazmat/backends/openssl/x509.py
+++ b/src/cryptography/hazmat/backends/openssl/x509.py
@@ -238,7 +238,8 @@
                 if d2i == backend._ffi.NULL:
                     backend._consume_errors()
                     raise ValueError(
-                        "The {0} extension appears to be corrupt".format(oid)
+                        "The {0} extension is invalid and can't be "
+                        "parsed".format(oid)
                     )
 
                 value = handler(backend, d2i)
diff --git a/tests/test_x509_ext.py b/tests/test_x509_ext.py
index 2980808..890709a 100644
--- a/tests/test_x509_ext.py
+++ b/tests/test_x509_ext.py
@@ -2857,7 +2857,7 @@
 
 @pytest.mark.requires_backend_interface(interface=RSABackend)
 @pytest.mark.requires_backend_interface(interface=X509Backend)
-class TestCorruptExtension(object):
+class TestInvalidExtension(object):
     def test_invalid_certificate_policies_data(self, backend):
         cert = _load_cert(
             os.path.join(