diff --git a/man/links b/man/links
index 94453bb..e981d5c 100644
--- a/man/links
+++ b/man/links
@@ -1494,6 +1494,7 @@ bn_dump.3,bn_wexpand.3
 bn_dump.3,mul.3
 bn_dump.3,mul_add.3
 bn_dump.3,sqr.3
+d2i_ASN1_NULL.3,i2d_ASN1_NULL.3
 d2i_ASN1_OBJECT.3,i2d_ASN1_OBJECT.3
 d2i_AUTHORITY_KEYID.3,i2d_AUTHORITY_KEYID.3
 d2i_BASIC_CONSTRAINTS.3,d2i_EXTENDED_KEY_USAGE.3