diff --git a/src/_cffi_src/openssl/err.py b/src/_cffi_src/openssl/err.py
index 4784408..041723c 100644
--- a/src/_cffi_src/openssl/err.py
+++ b/src/_cffi_src/openssl/err.py
@@ -57,6 +57,7 @@
 static const int ASN1_F_B64_WRITE_ASN1;
 static const int ASN1_F_SMIME_READ_ASN1;
 static const int ASN1_F_SMIME_TEXT;
+static const int ASN1_F_ASN1_CHECK_TLEN;
 
 static const int ASN1_R_BOOLEAN_IS_WRONG_LENGTH;
 static const int ASN1_R_BUFFER_TOO_SMALL;