diff --git a/src/corelib/compat/removed_api.cpp b/src/corelib/compat/removed_api.cpp
index ba844715d8..c4fe85f84f 100644
--- a/src/corelib/compat/removed_api.cpp
+++ b/src/corelib/compat/removed_api.cpp
@@ -169,6 +169,8 @@ QCalendar::QCalendar(QStringView name)
 QCalendar::QCalendar(QLatin1StringView name)
     : QCalendar(QAnyStringView{name}) {}
 
+#include "qcollator.h" // inline function compare(ptr, n, ptr, n) (for MSVC)
+
 #if QT_CONFIG(future)
 
 #include "qfutureinterface.h"
diff --git a/src/corelib/text/qcollator.cpp b/src/corelib/text/qcollator.cpp
index f21df33af4..990c68c062 100644
--- a/src/corelib/text/qcollator.cpp
+++ b/src/corelib/text/qcollator.cpp
@@ -320,7 +320,7 @@ bool QCollator::ignorePunctuation() const
 */
 
 /*!
-    \fn int QCollator::compare(const QChar *s1, int len1, const QChar *s2, int len2) const
+    \fn int QCollator::compare(const QChar *s1, qsizetype len1, const QChar *s2, qsizetype len2) const
     \overload
     \since 5.2
 
@@ -329,6 +329,9 @@ bool QCollator::ignorePunctuation() const
 
     Returns an integer less than, equal to, or greater than zero depending on
     whether \a s1 sorts before, with or after \a s2.
+
+    \note In Qt versions prior to 6.4, the length arguments were of type
+    \c{int}, not \c{qsizetype}.
 */
 
 /*!
diff --git a/src/corelib/text/qcollator.h b/src/corelib/text/qcollator.h
index 76a453c6ae..6f4882989b 100644
--- a/src/corelib/text/qcollator.h
+++ b/src/corelib/text/qcollator.h
@@ -67,8 +67,12 @@ public:
 
     int compare(const QString &s1, const QString &s2) const
     { return compare(QStringView(s1), QStringView(s2)); }
+#if QT_CORE_REMOVED_SINCE(6, 4) && QT_POINTER_SIZE != 4
     int compare(const QChar *s1, int len1, const QChar *s2, int len2) const
     { return compare(QStringView(s1, len1), QStringView(s2, len2)); }
+#endif
+    int compare(const QChar *s1, qsizetype len1, const QChar *s2, qsizetype len2) const
+    { return compare(QStringView(s1, len1), QStringView(s2, len2)); }
 
     bool operator()(const QString &s1, const QString &s2) const
     { return compare(s1, s2) < 0; }