diff --git a/cryptography/hazmat/backends/openssl/asn1.py b/cryptography/hazmat/backends/openssl/asn1.py
index ec25c22..07bb32f 100644
--- a/cryptography/hazmat/backends/openssl/asn1.py
+++ b/cryptography/hazmat/backends/openssl/asn1.py
@@ -118,7 +118,7 @@
 long ASN1_INTEGER_get(ASN1_INTEGER *);
 
 BIGNUM *ASN1_INTEGER_to_BN(ASN1_INTEGER *, BIGNUM *);
-ASN1_INTEGER *BN_to_ASN1_INTEGER(const BIGNUM *bn, ASN1_INTEGER *ai);
+ASN1_INTEGER *BN_to_ASN1_INTEGER(const BIGNUM *, ASN1_INTEGER *);
 """
 
 CUSTOMIZATIONS = """
diff --git a/cryptography/hazmat/backends/openssl/objects.py b/cryptography/hazmat/backends/openssl/objects.py
index b3a2c2c..aff1c49 100644
--- a/cryptography/hazmat/backends/openssl/objects.py
+++ b/cryptography/hazmat/backends/openssl/objects.py
@@ -19,19 +19,19 @@
 """
 
 FUNCTIONS = """
-ASN1_OBJECT * OBJ_nid2obj(int n);
-const char *  OBJ_nid2ln(int n);
-const char *  OBJ_nid2sn(int n);
-int OBJ_obj2nid(const ASN1_OBJECT *o);
-int OBJ_ln2nid(const char *ln);
-int OBJ_sn2nid(const char *sn);
-int OBJ_txt2nid(const char *s);
-ASN1_OBJECT * OBJ_txt2obj(const char *s, int no_name);
-int OBJ_obj2txt(char *buf, int buf_len, const ASN1_OBJECT *a, int no_name);
-int OBJ_cmp(const ASN1_OBJECT *a,const ASN1_OBJECT *b);
-ASN1_OBJECT * OBJ_dup(const ASN1_OBJECT *o);
-int OBJ_create(const char *oid,const char *sn,const char *ln);
-void OBJ_cleanup(void);
+ASN1_OBJECT * OBJ_nid2obj(int);
+const char * OBJ_nid2ln(int);
+const char * OBJ_nid2sn(int);
+int OBJ_obj2nid(const ASN1_OBJECT *);
+int OBJ_ln2nid(const char *);
+int OBJ_sn2nid(const char *);
+int OBJ_txt2nid(const char *);
+ASN1_OBJECT * OBJ_txt2obj(const char *, int);
+int OBJ_obj2txt(char *, int, const ASN1_OBJECT *, int);
+int OBJ_cmp(const ASN1_OBJECT *, const ASN1_OBJECT *);
+ASN1_OBJECT * OBJ_dup(const ASN1_OBJECT *);
+int OBJ_create(const char *, const char *, const char *);
+void OBJ_cleanup();
 """
 
 MACROS = """
diff --git a/cryptography/hazmat/backends/openssl/rsa.py b/cryptography/hazmat/backends/openssl/rsa.py
index f9d9cb5..6cee569 100644
--- a/cryptography/hazmat/backends/openssl/rsa.py
+++ b/cryptography/hazmat/backends/openssl/rsa.py
@@ -51,7 +51,7 @@
                        RSA *, int);
 int RSA_private_decrypt(int, const unsigned char *, unsigned char *,
                         RSA *, int);
-int RSA_print(BIO *bp, const RSA *r,int offset);
+int RSA_print(BIO *, const RSA *, int);
 """
 
 MACROS = """