diff --git a/src/corelib/serialization/qjsonarray.h b/src/corelib/serialization/qjsonarray.h
index a8c3760565..d8a7e2e12b 100644
--- a/src/corelib/serialization/qjsonarray.h
+++ b/src/corelib/serialization/qjsonarray.h
@@ -128,8 +128,7 @@ public:
         inline QJsonValueRef operator*() const { return item; }
         inline const QJsonValueConstRef *operator->() const { return &item; }
         inline QJsonValueRef *operator->() { return &item; }
-        inline QJsonValueRef operator[](qsizetype j) const
-        { return { item.a, qsizetype(item.index) + j }; }
+        inline QJsonValueRef operator[](qsizetype j) const { return *(*this + j); }
 
         inline bool operator==(const iterator &o) const
         { return item.a == o.item.a && item.index == o.item.index; }
@@ -155,10 +154,8 @@ public:
         inline iterator operator--(int) { iterator n = *this; item.index--; return n; }
         inline iterator &operator+=(qsizetype j) { item.index += quint64(j); return *this; }
         inline iterator &operator-=(qsizetype j) { item.index -= quint64(j); return *this; }
-        inline iterator operator+(qsizetype j) const
-        { return iterator(item.a, qsizetype(item.index) + j); }
-        inline iterator operator-(qsizetype j) const
-        { return iterator(item.a, qsizetype(item.index) - j); }
+        inline iterator operator+(qsizetype j) const { iterator r = *this; return r += j; }
+        inline iterator operator-(qsizetype j) const { return operator+(-j); }
         inline qsizetype operator-(iterator j) const { return item.index - j.item.index; }
 
     private:
@@ -191,8 +188,7 @@ public:
         inline const QJsonValueConstRef operator*() const { return item; }
         inline const QJsonValueConstRef *operator->() const { return &item; }
 
-        inline QJsonValueConstRef operator[](qsizetype j) const
-        { return QJsonValueRef{ item.a, qsizetype(item.index) + j }; }
+        inline QJsonValueConstRef operator[](qsizetype j) const { return *(*this + j); }
         inline bool operator==(const const_iterator &o) const
         { return item.a == o.item.a && item.index == o.item.index; }
         inline bool operator!=(const const_iterator &o) const { return !(*this == o); }
@@ -208,10 +204,8 @@ public:
         inline const_iterator operator--(int) { const_iterator n = *this; item.index--; return n; }
         inline const_iterator &operator+=(qsizetype j) { item.index += quint64(j); return *this; }
         inline const_iterator &operator-=(qsizetype j) { item.index -= quint64(j); return *this; }
-        inline const_iterator operator+(qsizetype j) const
-        { return const_iterator(item.a, qsizetype(item.index) + j); }
-        inline const_iterator operator-(qsizetype j) const
-        { return const_iterator(item.a, qsizetype(item.index) - j); }
+        inline const_iterator operator+(qsizetype j) const { const_iterator r = *this; return r += j; }
+        inline const_iterator operator-(qsizetype j) const { return operator+(-j); }
         inline qsizetype operator-(const_iterator j) const { return item.index - j.item.index; }
 
     private:
diff --git a/src/corelib/serialization/qjsonobject.cpp b/src/corelib/serialization/qjsonobject.cpp
index 9eeb11cc38..2497f42a1a 100644
--- a/src/corelib/serialization/qjsonobject.cpp
+++ b/src/corelib/serialization/qjsonobject.cpp
@@ -1012,7 +1012,7 @@ QJsonObject::const_iterator QJsonObject::constFindImpl(T key) const
     Returns a pointer to a constant reference to the current item.
 */
 
-/*! \fn const QJsonValueRef QJsonObject::iterator::operator[](qsizetype j)
+/*! \fn const QJsonValueRef QJsonObject::iterator::operator[](qsizetype j) const
 
     Returns a modifiable reference to the item at offset \a j from the
     item pointed to by this iterator (the item at position \c{*this + j}).
@@ -1263,7 +1263,7 @@ QJsonObject::const_iterator QJsonObject::constFindImpl(T key) const
     Returns a pointer to the current item.
 */
 
-/*! \fn const QJsonValueConstRef QJsonObject::const_iterator::operator[](qsizetype j)
+/*! \fn const QJsonValueConstRef QJsonObject::const_iterator::operator[](qsizetype j) const
 
     Returns the item at offset \a j from the item pointed to by this iterator (the item at
     position \c{*this + j}).
diff --git a/src/corelib/serialization/qjsonobject.h b/src/corelib/serialization/qjsonobject.h
index 74f6905b60..1389f7b472 100644
--- a/src/corelib/serialization/qjsonobject.h
+++ b/src/corelib/serialization/qjsonobject.h
@@ -146,7 +146,7 @@ public:
         inline QJsonValueRef operator*() const { return item; }
         inline const QJsonValueConstRef *operator->() const { return &item; }
         inline QJsonValueRef *operator->() { return &item; }
-        const QJsonValueRef operator[](qsizetype j) { return { item.o, qsizetype(item.index) + j }; }
+        inline QJsonValueRef operator[](qsizetype j) const { return *(*this + j); }
 
         inline bool operator==(const iterator &other) const
         { return item.o == other.item.o && item.index == other.item.index; }
@@ -162,8 +162,7 @@ public:
         inline iterator operator++(int) { iterator r = *this; ++item.index; return r; }
         inline iterator &operator--() { --item.index; return *this; }
         inline iterator operator--(int) { iterator r = *this; --item.index; return r; }
-        inline iterator operator+(qsizetype j) const
-        { iterator r = *this; r.item.index += quint64(j); return r; }
+        inline iterator operator+(qsizetype j) const { iterator r = *this; return r += j; }
         inline iterator operator-(qsizetype j) const { return operator+(-j); }
         inline iterator &operator+=(qsizetype j) { item.index += quint64(j); return *this; }
         inline iterator &operator-=(qsizetype j) { item.index -= quint64(j); return *this; }
@@ -212,7 +211,7 @@ public:
         inline QJsonValueConstRef value() const { return item; }
         inline const QJsonValueConstRef operator*() const { return item; }
         inline const QJsonValueConstRef *operator->() const { return &item; }
-        const QJsonValueConstRef operator[](qsizetype j) { return { item.o, qsizetype(item.index) + j }; }
+        inline QJsonValueConstRef operator[](qsizetype j) const { return *(*this + j); }
 
         inline bool operator==(const const_iterator &other) const
         { return item.o == other.item.o && item.index == other.item.index; }
@@ -228,8 +227,7 @@ public:
         inline const_iterator operator++(int) { const_iterator r = *this; ++item.index; return r; }
         inline const_iterator &operator--() { --item.index; return *this; }
         inline const_iterator operator--(int) { const_iterator r = *this; --item.index; return r; }
-        inline const_iterator operator+(qsizetype j) const
-        { const_iterator r = *this; r.item.index += quint64(j); return r; }
+        inline const_iterator operator+(qsizetype j) const { const_iterator r = *this; return r += j; }
         inline const_iterator operator-(qsizetype j) const { return operator+(-j); }
         inline const_iterator &operator+=(qsizetype j) { item.index += quint64(j); return *this; }
         inline const_iterator &operator-=(qsizetype j) { item.index -= quint64(j); return *this; }