diff --git a/src/sql/kernel/qsqlindex.cpp b/src/sql/kernel/qsqlindex.cpp
index 53e13c85e6..bb80cf3e03 100644
--- a/src/sql/kernel/qsqlindex.cpp
+++ b/src/sql/kernel/qsqlindex.cpp
@@ -38,6 +38,9 @@
 
 QT_BEGIN_NAMESPACE
 
+// ### Qt 6: remove the static assertion, the 'sorts' field was changed from QList to QVector in Qt 5.6
+Q_STATIC_ASSERT((sizeof(QList<bool>) == sizeof(QVector<bool>)));
+
 /*!
     \class QSqlIndex
     \brief The QSqlIndex class provides functions to manipulate and
diff --git a/src/sql/kernel/qsqlindex.h b/src/sql/kernel/qsqlindex.h
index d3d4a7c9aa..4a81d48161 100644
--- a/src/sql/kernel/qsqlindex.h
+++ b/src/sql/kernel/qsqlindex.h
@@ -36,7 +36,10 @@
 
 #include <QtSql/qsqlrecord.h>
 #include <QtCore/qstring.h>
+#include <QtCore/qvector.h>
+#if QT_DEPRECATED_SINCE(5,6)
 #include <QtCore/qlist.h>
+#endif
 
 QT_BEGIN_NAMESPACE
 
@@ -63,7 +66,7 @@ private:
     QString createField(int i, const QString& prefix, bool verbose) const;
     QString cursor;
     QString nm;
-    QList<bool> sorts;
+    QVector<bool> sorts;
 };
 
 QT_END_NAMESPACE