diff --git a/crypto/x509/x509_vfy.h b/crypto/x509/x509_vfy.h
index d8d34879a..66e97b7a3 100644
--- a/crypto/x509/x509_vfy.h
+++ b/crypto/x509/x509_vfy.h
@@ -459,6 +459,7 @@ X509_POLICY_TREE *X509_STORE_CTX_get0_policy_tree(X509_STORE_CTX *ctx);
 int X509_STORE_CTX_get_explicit_policy(X509_STORE_CTX *ctx);
 
 X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(X509_STORE_CTX *ctx);
+void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param);
 int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name);
 
 /* X509_VERIFY_PARAM functions */