diff --git a/include/openssl/x509_vfy.h b/include/openssl/x509_vfy.h
index 64f56df7f07cc1453ce2f034e3b2608b1fb457be..1aa0a33b8a3226d1cc46f2161927b9525ac02d38 100644
--- a/include/openssl/x509_vfy.h
+++ b/include/openssl/x509_vfy.h
@@ -272,7 +272,6 @@ int X509_STORE_set_purpose(X509_STORE *ctx, int purpose);
 int X509_STORE_set_trust(X509_STORE *ctx, int trust);
 int X509_STORE_set1_param(X509_STORE *ctx, X509_VERIFY_PARAM *pm);
 X509_VERIFY_PARAM *X509_STORE_get0_param(X509_STORE *ctx);
-int X509_STORE_set_flags(X509_STORE *ctx, unsigned long flags);
 
 void X509_STORE_set_verify(X509_STORE *ctx, X509_STORE_CTX_verify_fn verify);
 #define X509_STORE_set_verify_func(ctx, func) \