diff --git a/libwsc/WebSocketClient.cpp b/libwsc/WebSocketClient.cpp
index 1803de8..c1473ee 100644
--- a/libwsc/WebSocketClient.cpp
+++ b/libwsc/WebSocketClient.cpp
@@ -203,7 +203,7 @@ void WebSocketClient::connect() {
 
     if (secure) {
 #ifdef USE_TLS
-        m_bev = bufferevent_openssl_socket_new(base, -1, ssl, BUFFEREVENT_SSL_CONNECTING, BEV_OPT_CLOSE_ON_FREE | BEV_OPT_DEFER_CALLBACKS);
+        m_bev = bufferevent_openssl_socket_new(base, -1, ssl, BUFFEREVENT_SSL_CONNECTING, BEV_OPT_CLOSE_ON_FREE | BEV_OPT_DEFER_CALLBACKS | BEV_OPT_THREADSAFE);
         if (!m_bev) {
             log_error("Failed to create secure bufferevent");
             cleanup();