diff --git a/src/shrpx_ssl.cc b/src/shrpx_ssl.cc
index af14a5d6..7bc2723e 100644
--- a/src/shrpx_ssl.cc
+++ b/src/shrpx_ssl.cc
@@ -131,7 +131,8 @@ int servername_callback(SSL *ssl, int *al, void *arg)
       }
     }
   }
-  return SSL_TLSEXT_ERR_NOACK;
+
+  return SSL_TLSEXT_ERR_OK;
 }
 } // namespace