diff --git a/docs/development/test-vectors.rst b/docs/development/test-vectors.rst
index e86f27afd..1916c57c4 100644
--- a/docs/development/test-vectors.rst
+++ b/docs/development/test-vectors.rst
@@ -483,6 +483,8 @@ Custom X.509 Vectors
   signature algorithm.
 * ``rsa_pss_cert_no_sig_params.der`` - A self-signed certificate with an invalid
   RSA PSS signature algorithm that is missing signature parameters for PSS.
+* ``rsa_pss_cert_unsupported_mgf_hash.der`` - A self-signed certificate with an
+  unsupported MGF1 hash algorithm in the signature algorithm.
 * ``long-form-name-attribute.pem`` - A certificate with ``subject`` and ``issuer``
   names containing attributes whose value's tag is encoded in long-form.
 * ``mismatch_inner_outer_sig_algorithm.der`` - A leaf certificate derived from
diff --git a/vectors/cryptography_vectors/x509/custom/rsa_pss_cert_unsupported_mgf_hash.der b/vectors/cryptography_vectors/x509/custom/rsa_pss_cert_unsupported_mgf_hash.der
new file mode 100644
index 000000000..d6276d098
Binary files /dev/null and b/vectors/cryptography_vectors/x509/custom/rsa_pss_cert_unsupported_mgf_hash.der differ