diff --git a/extension/socks5proxy/src/dnsresolver.h b/extension/socks5proxy/src/dnsresolver.h
index e642aee4e5..84aae14dbc 100644
--- a/extension/socks5proxy/src/dnsresolver.h
+++ b/extension/socks5proxy/src/dnsresolver.h
@@ -5,6 +5,7 @@
 #pragma once
 
 #include <QHostAddress>
+#include <mutex>
 
 struct ares_channeldata;
 class ares_addrinfo;