diff --git a/src/_cffi_src/openssl/x509v3.py b/src/_cffi_src/openssl/x509v3.py
index cdd6df9..3612f1c 100644
--- a/src/_cffi_src/openssl/x509v3.py
+++ b/src/_cffi_src/openssl/x509v3.py
@@ -207,7 +207,6 @@
 
 POLICY_CONSTRAINTS *POLICY_CONSTRAINTS_new(void);
 void POLICY_CONSTRAINTS_free(POLICY_CONSTRAINTS *);
-int i2d_POLICY_CONSTRAINTS(POLICY_CONSTRAINTS *, unsigned char **);
 
 void *X509V3_set_ctx_nodb(X509V3_CTX *);