diff --git a/src/corelib/tools/qhashfunctions.h b/src/corelib/tools/qhashfunctions.h
index 90a269deaa5..f34c26d4985 100644
--- a/src/corelib/tools/qhashfunctions.h
+++ b/src/corelib/tools/qhashfunctions.h
@@ -231,8 +231,10 @@ constexpr inline bool HasQHashSingleArgOverload<T, std::enable_if_t<
 >> = true;
 }
 
-template <typename T, std::enable_if_t<QHashPrivate::HasQHashSingleArgOverload<T> && !std::is_enum_v<T>, bool> = true>
-size_t qHash(const T &t, size_t seed) noexcept(noexcept(qHash(t)))
+// Add Args... to make this overload consistently a worse match than
+// original 2-arg qHash overloads (QTBUG-126659)
+template <typename T, typename...Args, std::enable_if_t<QHashPrivate::HasQHashSingleArgOverload<T> && sizeof...(Args) == 0 && !std::is_enum_v<T>, bool> = true>
+size_t qHash(const T &t, size_t seed, Args&&...) noexcept(noexcept(qHash(t)))
 { return qHash(t) ^ seed; }
 #endif // < Qt 7
 
diff --git a/tests/auto/corelib/tools/qhashfunctions/tst_qhashfunctions.cpp b/tests/auto/corelib/tools/qhashfunctions/tst_qhashfunctions.cpp
index 00ee5763edc..4358aa0d1dc 100644
--- a/tests/auto/corelib/tools/qhashfunctions/tst_qhashfunctions.cpp
+++ b/tests/auto/corelib/tools/qhashfunctions/tst_qhashfunctions.cpp
@@ -3,6 +3,8 @@
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
 #include <QTest>
+
+#include <QtCore/qmap.h>
 #include <QVarLengthArray>
 
 #include <qhash.h>
@@ -44,6 +46,7 @@ private Q_SLOTS:
     void qhash_of_empty_and_null_qstring();
     void qhash_of_empty_and_null_qbytearray();
     void qhash_of_zero_floating_points();
+    void qmap();
     void qthash_data();
     void qthash();
     void range();
@@ -439,6 +442,14 @@ void tst_QHashFunctions::qhash_of_zero_floating_points()
     QCOMPARE(qHash(-0.0L, seed), qHash(0.0L, seed));
 }
 
+void tst_QHashFunctions::qmap()
+{
+    // QTBUG-126659
+    QMap<int, int> map;
+    size_t s = seed;
+    QCOMPARE(qHash(map, s), seed);
+}
+
 void tst_QHashFunctions::qthash_data()
 {
     QTest::addColumn<QString>("key");