diff --git a/asyncua/common/xmlimporter.py b/asyncua/common/xmlimporter.py
index d267e1bce..df6b9991e 100644
--- a/asyncua/common/xmlimporter.py
+++ b/asyncua/common/xmlimporter.py
@@ -482,7 +482,7 @@ def _set_attr(self, atttype, fargs, attname: str, val):
                     self._set_attr(sub_atttype, subargs, attname2, v2)
             if "Encoding" in subargs:
                 del subargs["Encoding"]
-            fargs[attname] = atttype(**subargs)
+            fargs[attname] = atttype(**subargs)  # type: ignore[operator]
         else:
             raise RuntimeError(f"Could not handle type {atttype} of type {type(atttype)}")
 
diff --git a/tests/test_gen_certificates.py b/tests/test_gen_certificates.py
index d94705708..772dd0d1b 100644
--- a/tests/test_gen_certificates.py
+++ b/tests/test_gen_certificates.py
@@ -6,7 +6,9 @@
 from cryptography.x509.oid import ExtendedKeyUsageOID, NameOID
 from cryptography.hazmat.primitives.asymmetric.rsa import RSAPrivateKey
 from cryptography.x509.extensions import _key_identifier_from_public_key as key_identifier_from_public_key
-from asyncua.crypto.cert_gen import generate_private_key, generate_app_certificate_signing_request, generate_self_signed_app_certificate, sign_certificate_request
+
+from asyncua.crypto.uacrypto import load_private_key
+from asyncua.crypto.cert_gen import generate_private_key, generate_app_certificate_signing_request, generate_self_signed_app_certificate, sign_certificate_request, dump_private_key_as_pem
 
 
 async def test_create_self_signed_app_certificate() -> None:
@@ -198,3 +200,11 @@ async def test_app_sign_certificate_request() -> None:
 
     assert cert.extensions.get_extension_for_class(
         x509.ExtendedKeyUsage).value == csr.extensions.get_extension_for_class(x509.ExtendedKeyUsage).value
+
+async def test_generate_load_private_key_pem(tmp_path):
+    key_path = tmp_path / "cert.pem"
+    key = generate_private_key()
+    key_path.write_bytes(dump_private_key_as_pem(key))
+
+    key2 = await load_private_key(key_path)
+    assert dump_private_key_as_pem(key) ==  dump_private_key_as_pem(key2)