diff --git a/src/network/socket/qsocks5socketengine_p.h b/src/network/socket/qsocks5socketengine_p.h
index fd063eb4fa4..80f9e92aec3 100644
--- a/src/network/socket/qsocks5socketengine_p.h
+++ b/src/network/socket/qsocks5socketengine_p.h
@@ -155,9 +155,9 @@ public:
     virtual bool beginAuthenticate(QTcpSocket *socket, bool *completed);
     virtual bool continueAuthenticate(QTcpSocket *socket, bool *completed);
 
-    virtual bool seal(const QByteArray &buf, QByteArray *sealedBuf);
-    virtual bool unSeal(const QByteArray &sealedBuf, QByteArray *buf);
-    virtual bool unSeal(QTcpSocket *sealedSocket, QByteArray *buf);
+    bool seal(const QByteArray &buf, QByteArray *sealedBuf);
+    bool unSeal(const QByteArray &sealedBuf, QByteArray *buf);
+    bool unSeal(QTcpSocket *sealedSocket, QByteArray *buf);
 
     virtual QString errorString() { return QString(); }
 };