diff --git a/src/corelib/text/qbytearray.cpp b/src/corelib/text/qbytearray.cpp
index 388646f3f3f..ec17c0e15ae 100644
--- a/src/corelib/text/qbytearray.cpp
+++ b/src/corelib/text/qbytearray.cpp
@@ -3485,7 +3485,7 @@ QDataStream &operator>>(QDataStream &in, QByteArray &ba)
     \sa QByteArray::compare()
 */
 
-/*! \fn const QByteArray operator+(const QByteArray &a1, const QByteArray &a2)
+/*! \fn QByteArray operator+(const QByteArray &a1, const QByteArray &a2)
     \relates QByteArray
 
     Returns a byte array that is the result of concatenating byte
@@ -3494,7 +3494,7 @@ QDataStream &operator>>(QDataStream &in, QByteArray &ba)
     \sa QByteArray::operator+=()
 */
 
-/*! \fn const QByteArray operator+(const QByteArray &a1, const char *a2)
+/*! \fn QByteArray operator+(const QByteArray &a1, const char *a2)
     \relates QByteArray
 
     \overload
@@ -3503,7 +3503,7 @@ QDataStream &operator>>(QDataStream &in, QByteArray &ba)
     and '\\0'-terminated string \a a2.
 */
 
-/*! \fn const QByteArray operator+(const QByteArray &a1, char a2)
+/*! \fn QByteArray operator+(const QByteArray &a1, char a2)
     \relates QByteArray
 
     \overload
@@ -3512,7 +3512,7 @@ QDataStream &operator>>(QDataStream &in, QByteArray &ba)
     array \a a1 and byte \a a2.
 */
 
-/*! \fn const QByteArray operator+(const char *a1, const QByteArray &a2)
+/*! \fn QByteArray operator+(const char *a1, const QByteArray &a2)
     \relates QByteArray
 
     \overload
@@ -3521,7 +3521,7 @@ QDataStream &operator>>(QDataStream &in, QByteArray &ba)
     string \a a1 and byte array \a a2.
 */
 
-/*! \fn const QByteArray operator+(char a1, const QByteArray &a2)
+/*! \fn QByteArray operator+(char a1, const QByteArray &a2)
     \relates QByteArray
 
     \overload
diff --git a/src/corelib/text/qbytearray.h b/src/corelib/text/qbytearray.h
index 7b174cf15bf..3a57b383dc5 100644
--- a/src/corelib/text/qbytearray.h
+++ b/src/corelib/text/qbytearray.h
@@ -547,15 +547,15 @@ inline int QByteArray::compare(QByteArrayView a, Qt::CaseSensitivity cs) const n
                                      qstrnicmp(data(), size(), a.data(), a.size());
 }
 #if !defined(QT_USE_QSTRINGBUILDER)
-inline const QByteArray operator+(const QByteArray &a1, const QByteArray &a2)
+inline QByteArray operator+(const QByteArray &a1, const QByteArray &a2)
 { return QByteArray(a1) += a2; }
-inline const QByteArray operator+(const QByteArray &a1, const char *a2)
+inline QByteArray operator+(const QByteArray &a1, const char *a2)
 { return QByteArray(a1) += a2; }
-inline const QByteArray operator+(const QByteArray &a1, char a2)
+inline QByteArray operator+(const QByteArray &a1, char a2)
 { return QByteArray(a1) += a2; }
-inline const QByteArray operator+(const char *a1, const QByteArray &a2)
+inline QByteArray operator+(const char *a1, const QByteArray &a2)
 { return QByteArray(a1) += a2; }
-inline const QByteArray operator+(char a1, const QByteArray &a2)
+inline QByteArray operator+(char a1, const QByteArray &a2)
 { return QByteArray(&a1, 1) += a2; }
 #endif // QT_USE_QSTRINGBUILDER
 
diff --git a/src/corelib/text/qstring.cpp b/src/corelib/text/qstring.cpp
index 96f09bf89bc..ca949b9b320 100644
--- a/src/corelib/text/qstring.cpp
+++ b/src/corelib/text/qstring.cpp
@@ -6276,7 +6276,7 @@ QString& QString::fill(QChar ch, qsizetype size)
 */
 
 /*!
-    \fn const QString operator+(const QString &s1, const QString &s2)
+    \fn QString operator+(const QString &s1, const QString &s2)
     \relates QString
 
     Returns a string which is the result of concatenating \a s1 and \a
@@ -6284,7 +6284,7 @@ QString& QString::fill(QChar ch, qsizetype size)
 */
 
 /*!
-    \fn const QString operator+(const QString &s1, const char *s2)
+    \fn QString operator+(const QString &s1, const char *s2)
     \relates QString
 
     Returns a string which is the result of concatenating \a s1 and \a
@@ -6295,7 +6295,7 @@ QString& QString::fill(QChar ch, qsizetype size)
 */
 
 /*!
-    \fn const QString operator+(const char *s1, const QString &s2)
+    \fn QString operator+(const char *s1, const QString &s2)
     \relates QString
 
     Returns a string which is the result of concatenating \a s1 and \a
diff --git a/src/corelib/text/qstring.h b/src/corelib/text/qstring.h
index 39a05883c55..d8d8cd34254 100644
--- a/src/corelib/text/qstring.h
+++ b/src/corelib/text/qstring.h
@@ -1464,20 +1464,20 @@ inline bool QByteArray::operator>=(const QString &s) const
 #endif // !defined(QT_NO_CAST_FROM_ASCII) && !defined(QT_RESTRICTED_CAST_FROM_ASCII)
 
 #if !defined(QT_USE_FAST_OPERATOR_PLUS) && !defined(QT_USE_QSTRINGBUILDER)
-inline const QString operator+(const QString &s1, const QString &s2)
+inline QString operator+(const QString &s1, const QString &s2)
 { QString t(s1); t += s2; return t; }
-inline const QString operator+(const QString &s1, QChar s2)
+inline QString operator+(const QString &s1, QChar s2)
 { QString t(s1); t += s2; return t; }
-inline const QString operator+(QChar s1, const QString &s2)
+inline QString operator+(QChar s1, const QString &s2)
 { QString t(s1); t += s2; return t; }
 #  if !defined(QT_NO_CAST_FROM_ASCII) && !defined(QT_RESTRICTED_CAST_FROM_ASCII)
-QT_ASCII_CAST_WARN inline const QString operator+(const QString &s1, const char *s2)
+QT_ASCII_CAST_WARN inline QString operator+(const QString &s1, const char *s2)
 { QString t(s1); t += QString::fromUtf8(s2); return t; }
-QT_ASCII_CAST_WARN inline const QString operator+(const char *s1, const QString &s2)
+QT_ASCII_CAST_WARN inline QString operator+(const char *s1, const QString &s2)
 { QString t = QString::fromUtf8(s1); t += s2; return t; }
-QT_ASCII_CAST_WARN inline const QString operator+(const QByteArray &ba, const QString &s)
+QT_ASCII_CAST_WARN inline QString operator+(const QByteArray &ba, const QString &s)
 { QString t = QString::fromUtf8(ba); t += s; return t; }
-QT_ASCII_CAST_WARN inline const QString operator+(const QString &s, const QByteArray &ba)
+QT_ASCII_CAST_WARN inline QString operator+(const QString &s, const QByteArray &ba)
 { QString t(s); t += QString::fromUtf8(ba); return t; }
 #  endif // QT_NO_CAST_FROM_ASCII
 #endif // QT_USE_QSTRINGBUILDER