diff --git a/cryptography/bindings/openssl/bignum.py b/cryptography/bindings/openssl/bignum.py
index 40397a5..72d467c 100644
--- a/cryptography/bindings/openssl/bignum.py
+++ b/cryptography/bindings/openssl/bignum.py
@@ -18,9 +18,6 @@
 TYPES = """
 typedef ... BIGNUM;
 typedef ... BN_ULONG;
-
-// Possibly belongs in an asn1.py
-typedef ... ASN1_INTEGER;
 """
 
 FUNCTIONS = """
@@ -34,5 +31,4 @@
 """
 
 MACROS = """
-ASN1_INTEGER *BN_to_ASN1_INTEGER(BIGNUM *, ASN1_INTEGER *);
 """