diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index e6d96b14b..50746e7ac 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -517,7 +517,8 @@ ngx_ssl_info_callback(const ngx_ssl_conn_t *ssl_conn, int where, int ret)
 
 
 RSA *
-ngx_ssl_rsa512_key_callback(SSL *ssl, int is_export, int key_length)
+ngx_ssl_rsa512_key_callback(ngx_ssl_conn_t *ssl_conn, int is_export,
+    int key_length)
 {
     static RSA  *key;
 
diff --git a/src/event/ngx_event_openssl.h b/src/event/ngx_event_openssl.h
index bf81d2529..790702ea8 100644
--- a/src/event/ngx_event_openssl.h
+++ b/src/event/ngx_event_openssl.h
@@ -109,7 +109,8 @@ ngx_int_t ngx_ssl_stapling(ngx_conf_t *cf, ngx_ssl_t *ssl,
     ngx_str_t *file, ngx_str_t *responder, ngx_uint_t verify);
 ngx_int_t ngx_ssl_stapling_resolver(ngx_conf_t *cf, ngx_ssl_t *ssl,
     ngx_resolver_t *resolver, ngx_msec_t resolver_timeout);
-RSA *ngx_ssl_rsa512_key_callback(SSL *ssl, int is_export, int key_length);
+RSA *ngx_ssl_rsa512_key_callback(ngx_ssl_conn_t *ssl_conn, int is_export,
+    int key_length);
 ngx_int_t ngx_ssl_dhparam(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *file);
 ngx_int_t ngx_ssl_ecdh_curve(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *name);
 ngx_int_t ngx_ssl_session_cache(ngx_ssl_t *ssl, ngx_str_t *sess_ctx,