diff --git a/src/corelib/compat/removed_api.cpp b/src/corelib/compat/removed_api.cpp
index 7c3dbd3be26..2b001429549 100644
--- a/src/corelib/compat/removed_api.cpp
+++ b/src/corelib/compat/removed_api.cpp
@@ -170,6 +170,18 @@ QCalendar::QCalendar(QLatin1StringView name)
     : QCalendar(QAnyStringView{name}) {}
 
 
+#include "qhashfunctions.h"
+
+size_t qHash(const QByteArray &key, size_t seed) noexcept
+{
+    return qHashBits(key.constData(), size_t(key.size()), seed);
+}
+
+size_t qHash(const QByteArrayView &key, size_t seed) noexcept
+{
+    return qHashBits(key.constData(), size_t(key.size()), seed);
+}
+
 #include "qobject.h"
 
 void QObject::setObjectName(const QString &name)
diff --git a/src/corelib/tools/qhash.cpp b/src/corelib/tools/qhash.cpp
index c973eaeabe9..2d9b6750c20 100644
--- a/src/corelib/tools/qhash.cpp
+++ b/src/corelib/tools/qhash.cpp
@@ -957,12 +957,7 @@ size_t qHashBits(const void *p, size_t size, size_t seed) noexcept
     return siphash(reinterpret_cast<const uchar *>(p), size, seed, seed2);
 }
 
-size_t qHash(const QByteArray &key, size_t seed) noexcept
-{
-    return qHashBits(key.constData(), size_t(key.size()), seed);
-}
-
-size_t qHash(const QByteArrayView &key, size_t seed) noexcept
+size_t qHash(QByteArrayView key, size_t seed) noexcept
 {
     return qHashBits(key.constData(), size_t(key.size()), seed);
 }
diff --git a/src/corelib/tools/qhashfunctions.h b/src/corelib/tools/qhashfunctions.h
index 04d165983da..58f4afc94f3 100644
--- a/src/corelib/tools/qhashfunctions.h
+++ b/src/corelib/tools/qhashfunctions.h
@@ -144,8 +144,16 @@ Q_DECL_CONST_FUNCTION constexpr inline size_t qHash(std::nullptr_t, size_t seed
 
 // (some) Qt types
 Q_DECL_CONST_FUNCTION constexpr inline size_t qHash(const QChar key, size_t seed = 0) noexcept { return qHash(key.unicode(), seed); }
+
+#if QT_CORE_REMOVED_SINCE(6, 4)
 Q_CORE_EXPORT Q_DECL_PURE_FUNCTION size_t qHash(const QByteArray &key, size_t seed = 0) noexcept;
 Q_CORE_EXPORT Q_DECL_PURE_FUNCTION size_t qHash(const QByteArrayView &key, size_t seed = 0) noexcept;
+#else
+Q_CORE_EXPORT Q_DECL_PURE_FUNCTION size_t qHash(QByteArrayView key, size_t seed = 0) noexcept;
+inline Q_DECL_PURE_FUNCTION size_t qHash(const QByteArray &key, size_t seed = 0 QT6_ONLY(, int = 0)) noexcept
+{ return qHash(qToByteArrayViewIgnoringNull(key), seed); }
+#endif
+
 Q_CORE_EXPORT Q_DECL_PURE_FUNCTION size_t qHash(QStringView key, size_t seed = 0) noexcept;
 #if QT_STRINGVIEW_LEVEL < 2
 inline Q_DECL_PURE_FUNCTION size_t qHash(const QString &key, size_t seed = 0) noexcept