diff --git a/src/corelib/text/qbytearray.h b/src/corelib/text/qbytearray.h
index 972e2174d3f..3b99ef78b27 100644
--- a/src/corelib/text/qbytearray.h
+++ b/src/corelib/text/qbytearray.h
@@ -715,7 +715,7 @@ namespace Qt {
 inline namespace Literals {
 inline namespace StringLiterals {
 
-inline QByteArray operator"" _ba(const char *str, size_t size) noexcept
+inline QByteArray operator""_ba(const char *str, size_t size) noexcept
 {
     return QByteArray(QByteArrayData(nullptr, const_cast<char *>(str), qsizetype(size)));
 }
@@ -728,7 +728,7 @@ inline namespace QtLiterals {
 #if QT_DEPRECATED_SINCE(6, 8)
 
 QT_DEPRECATED_VERSION_X_6_8("Use _ba from Qt::StringLiterals namespace instead.")
-inline QByteArray operator"" _qba(const char *str, size_t size) noexcept
+inline QByteArray operator""_qba(const char *str, size_t size) noexcept
 {
     return Qt::StringLiterals::operator""_ba(str, size);
 }
diff --git a/src/corelib/text/qchar.h b/src/corelib/text/qchar.h
index e9f0cf3346c..30a15f96a28 100644
--- a/src/corelib/text/qchar.h
+++ b/src/corelib/text/qchar.h
@@ -627,7 +627,7 @@ namespace Qt {
 inline namespace Literals {
 inline namespace StringLiterals {
 
-constexpr inline QLatin1Char operator"" _L1(char ch) noexcept
+constexpr inline QLatin1Char operator""_L1(char ch) noexcept
 {
     return QLatin1Char(ch);
 }
diff --git a/src/corelib/text/qlatin1stringview.h b/src/corelib/text/qlatin1stringview.h
index 257e7b30065..4a7bf357ed3 100644
--- a/src/corelib/text/qlatin1stringview.h
+++ b/src/corelib/text/qlatin1stringview.h
@@ -352,7 +352,7 @@ namespace Qt {
 inline namespace Literals {
 inline namespace StringLiterals {
 
-constexpr inline QLatin1StringView operator"" _L1(const char *str, size_t size) noexcept
+constexpr inline QLatin1StringView operator""_L1(const char *str, size_t size) noexcept
 {
     return {str, qsizetype(size)};
 }
diff --git a/src/corelib/text/qstring.h b/src/corelib/text/qstring.h
index b67ed099de0..c00885dab25 100644
--- a/src/corelib/text/qstring.h
+++ b/src/corelib/text/qstring.h
@@ -1470,7 +1470,7 @@ qsizetype erase_if(QString &s, Predicate pred)
 namespace Qt {
 inline namespace Literals {
 inline namespace StringLiterals {
-inline QString operator"" _s(const char16_t *str, size_t size) noexcept
+inline QString operator""_s(const char16_t *str, size_t size) noexcept
 {
     return QString(QStringPrivate(nullptr, const_cast<char16_t *>(str), qsizetype(size)));
 }
@@ -1483,7 +1483,7 @@ inline namespace QtLiterals {
 #if QT_DEPRECATED_SINCE(6, 8)
 
 QT_DEPRECATED_VERSION_X_6_8("Use _s from Qt::StringLiterals namespace instead.")
-inline QString operator"" _qs(const char16_t *str, size_t size) noexcept
+inline QString operator""_qs(const char16_t *str, size_t size) noexcept
 {
     return Qt::StringLiterals::operator""_s(str, size);
 }