too many rsas makes me rsa blind
diff --git a/cryptography/bindings/openssl/rsa.py b/cryptography/bindings/openssl/rsa.py
index 49cde72..75afb57 100644
--- a/cryptography/bindings/openssl/rsa.py
+++ b/cryptography/bindings/openssl/rsa.py
@@ -23,7 +23,7 @@
 FUNCTIONS = """
 RSA* RSA_new();
 void RSA_free(RSA *);
-int RSA_generate_key_ex(RSA *rsa, int, BIGNUM *, BN_GENCB *);
+int RSA_generate_key_ex(RSA *, int, BIGNUM *, BN_GENCB *);
 int RSA_check_key(const RSA *);
 """