diff --git a/gimmecert/crypto.py b/gimmecert/crypto.py
index c03a21cecd75e890f2c731e6760ac5ce08fe8206..ff5324ab7de12c9467e02df4b1963855018f0c2c 100644
--- a/gimmecert/crypto.py
+++ b/gimmecert/crypto.py
@@ -89,7 +89,7 @@ class KeyGenerator:
             )
         else:
             private_key = cryptography.hazmat.primitives.asymmetric.ec.generate_private_key(
-                curve=self._parameters
+                curve=self._parameters()
             )
 
         return private_key