diff --git a/cryptography/bindings/openssl/bignum.py b/cryptography/bindings/openssl/bignum.py
index 258847a..40397a5 100644
--- a/cryptography/bindings/openssl/bignum.py
+++ b/cryptography/bindings/openssl/bignum.py
@@ -31,9 +31,8 @@
 
 char *BN_bn2hex(const BIGNUM *);
 int BN_hex2bn(BIGNUM **, const char *);
-
-ASN1_INTEGER *BN_to_ASN1_INTEGER(BIGNUM *, ASN1_INTEGER *);
 """
 
 MACROS = """
+ASN1_INTEGER *BN_to_ASN1_INTEGER(BIGNUM *, ASN1_INTEGER *);
 """