diff --git a/src/models/mergeproxymodel.cpp b/src/models/mergeproxymodel.cpp
index 9edec8a..c0f24cd 100644
--- a/src/models/mergeproxymodel.cpp
+++ b/src/models/mergeproxymodel.cpp
@@ -188,7 +188,7 @@ void MergeProxyModelPrivate::slotSourceLayoutAboutToBeChanged(const QList<QPersi
     const QModelIndexList persistentIndexList = q->persistentIndexList();
     layoutChangePersistentIndexes.reserve(persistentIndexList.size());
 
-    for (const QPersistentModelIndex &proxyPersistentIndex : persistentIndexList) {
+    for (const QPersistentModelIndex &proxyPersistentIndex : std::as_const(persistentIndexList)) {
         proxyIndexes << proxyPersistentIndex;
         Q_ASSERT(proxyPersistentIndex.isValid());
         const QPersistentModelIndex srcPersistentIndex = q->mapToSource(proxyPersistentIndex);