diff --git a/src/corelib/time/qdatetimeparser.cpp b/src/corelib/time/qdatetimeparser.cpp
index cd237705d2..61707a3b2d 100644
--- a/src/corelib/time/qdatetimeparser.cpp
+++ b/src/corelib/time/qdatetimeparser.cpp
@@ -1012,7 +1012,7 @@ static int yearInCenturyFrom(int y2d, int baseYear)
   when on valid date is consistent with the data.
 */
 
-static QDate actualDate(QDateTimeParser::Sections known, const QCalendar &calendar, int baseYear,
+static QDate actualDate(QDateTimeParser::Sections known, QCalendar calendar, int baseYear,
                         int year, int year2digits, int month, int day, int dayofweek)
 {
     QDate actual(year, month, day, calendar);
@@ -2327,7 +2327,7 @@ bool operator==(const QDateTimeParser::SectionNode &s1, const QDateTimeParser::S
   Sets \a cal as the calendar to use. The default is Gregorian.
 */
 
-void QDateTimeParser::setCalendar(const QCalendar &cal)
+void QDateTimeParser::setCalendar(QCalendar cal)
 {
     calendar = cal;
 }
diff --git a/src/corelib/time/qdatetimeparser_p.h b/src/corelib/time/qdatetimeparser_p.h
index 9720ee2ef1..faf383f3d7 100644
--- a/src/corelib/time/qdatetimeparser_p.h
+++ b/src/corelib/time/qdatetimeparser_p.h
@@ -46,7 +46,7 @@ public:
         FromString,
         DateTimeEdit
     };
-    QDateTimeParser(QMetaType::Type t, Context ctx, const QCalendar &cal = QCalendar())
+    QDateTimeParser(QMetaType::Type t, Context ctx, QCalendar cal = QCalendar())
         : parserType(t), context(ctx), calendar(cal)
     {
         defaultLocale = QLocale::system();
@@ -153,7 +153,7 @@ public:
 
     void setDefaultLocale(const QLocale &loc) { defaultLocale = loc; }
     virtual QString displayText() const { return m_text; }
-    void setCalendar(const QCalendar &calendar);
+    void setCalendar(QCalendar calendar);
 
 private:
     int sectionMaxSize(Section s, int count) const;