diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index fdbd0c9..2c4e114 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -1300,7 +1300,7 @@
 #ifdef SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS
 
         /* initial handshake done, disable renegotiation (CVE-2009-3555) */
-        if (c->ssl->connection->s3) {
+        if (c->ssl->connection->s3 && SSL_is_server(c->ssl->connection)) {
             c->ssl->connection->s3->flags |= SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS;
         }