diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index 4f07894ff..a5af0ed3d 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -1888,7 +1888,7 @@ ngx_ssl_set_client_hello_callback(ngx_ssl_t *ssl, ngx_ssl_client_hello_arg *cb)
 
 #elif defined OPENSSL_IS_BORINGSSL
 
-    SSL_CTX_set_select_certificate_cb(ssl_ctx, ngx_ssl_select_certificate);
+    SSL_CTX_set_select_certificate_cb(ssl->ctx, ngx_ssl_select_certificate);
 
     if (SSL_CTX_set_ex_data(ssl->ctx, ngx_ssl_client_hello_arg_index, cb) == 0)
     {