diff --git a/tests/test_x509.py b/tests/test_x509.py
index 0b44ab4..b85eca3 100644
--- a/tests/test_x509.py
+++ b/tests/test_x509.py
@@ -2889,6 +2889,7 @@
         )
 
     def test_tbs_certificate(self, backend):
+        _skip_curve_unsupported(backend, ec.SECP384R1())
         cert = _load_cert(
             os.path.join("x509", "ecdsa_root.pem"),
             x509.load_pem_x509_certificate,