diff --git a/src/widgets/widgets/qcalendarwidget.cpp b/src/widgets/widgets/qcalendarwidget.cpp
index 4309881fe2..f718ce6a69 100644
--- a/src/widgets/widgets/qcalendarwidget.cpp
+++ b/src/widgets/widgets/qcalendarwidget.cpp
@@ -86,11 +86,11 @@ public:
     QLocale m_locale;
 
 protected:
-    QString highlightString(const QString &str, int pos) const;
+    static QString highlightString(const QString &str, int pos);
 private:
 };
 
-QString QCalendarDateSectionValidator::highlightString(const QString &str, int pos) const
+QString QCalendarDateSectionValidator::highlightString(const QString &str, int pos)
 {
     if (pos == 0)
         return QLatin1String("<b>") + str + QLatin1String("</b>");