diff --git a/poorman_handshake/asymmetric/utils.py b/poorman_handshake/asymmetric/utils.py
index 4806b82..f3e60bc 100644
--- a/poorman_handshake/asymmetric/utils.py
+++ b/poorman_handshake/asymmetric/utils.py
@@ -30,6 +30,7 @@ def export_private_key(path, key=None):
     logging.warning(
         "export_private_key is deprecated and will be removed in a future version. Use export_RSA_key instead."
     )
+    key = key or RSA.generate(2048)
     export_RSA_key(key, path)