error passing QString ?

[vieraci]

I have this compile error which has got me stumped.

error: passing ‘const QString’ as ‘this’ argument of ‘QString& QString::remove(const QRegExp&)’ discards qualifiers

the code in question is:

QString getPhoneMask(const QString &text)
{
    QString tmp = text.remove(QRegExp("[()-]"));

QString getPhoneMask(const QString &text)
{
    QString tmp = text.remove(QRegExp("[()-]"));

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I don't understand this...can anyone decipher the message ?