diff --git a/src/corelib/itemmodels/qsortfilterproxymodel.cpp b/src/corelib/itemmodels/qsortfilterproxymodel.cpp
index a9ead2e1eb..a5284dbad4 100644
--- a/src/corelib/itemmodels/qsortfilterproxymodel.cpp
+++ b/src/corelib/itemmodels/qsortfilterproxymodel.cpp
@@ -688,8 +688,10 @@ void QSortFilterProxyModelPrivate::sort_source_rows(
             QSortFilterProxyModelGreaterThan gt(source_sort_column, source_parent, model, q);
             std::stable_sort(source_rows.begin(), source_rows.end(), gt);
         }
-    } else { // restore the source model order
-        std::stable_sort(source_rows.begin(), source_rows.end());
+    } else if (sort_order == Qt::AscendingOrder) {
+        std::stable_sort(source_rows.begin(), source_rows.end(), std::less{});
+    } else {
+        std::stable_sort(source_rows.begin(), source_rows.end(), std::greater{});
     }
 }
 
@@ -2490,7 +2492,10 @@ QSize QSortFilterProxyModel::span(const QModelIndex &index) const
 }
 
 /*!
-  \reimp
+    \reimp
+    Sorts the model by \a column in the given \a order.
+    If the sort \a column is less than zero, the model will be sorted by source model row
+    in the given \a order.
 */
 void QSortFilterProxyModel::sort(int column, Qt::SortOrder order)
 {
diff --git a/tests/auto/corelib/itemmodels/qsortfilterproxymodel/tst_qsortfilterproxymodel.cpp b/tests/auto/corelib/itemmodels/qsortfilterproxymodel/tst_qsortfilterproxymodel.cpp
index 5a06a4a605..0e027461aa 100644
--- a/tests/auto/corelib/itemmodels/qsortfilterproxymodel/tst_qsortfilterproxymodel.cpp
+++ b/tests/auto/corelib/itemmodels/qsortfilterproxymodel/tst_qsortfilterproxymodel.cpp
@@ -247,13 +247,16 @@ void tst_QSortFilterProxyModel::sort()
         QCOMPARE(m_proxy->data(index, Qt::DisplayRole).toString(), expected.at(row));
     }
 
-    // restore the unsorted order
-    m_proxy->sort(-1);
+    // restore the unsorted order in the given order
+    m_proxy->sort(-1, sortOrder);
 
-    // make sure the proxy is unsorted again
+    // make sure the proxy is sorted by source row in the given order
+    int sourceIndex = sortOrder == Qt::AscendingOrder ? 0 : initial.size() - 1;
+    int adjustmentValue = sortOrder == Qt::AscendingOrder ? 1 : -1;
     for (int row = 0; row < m_proxy->rowCount(QModelIndex()); ++row) {
         QModelIndex index = m_proxy->index(row, 0, QModelIndex());
-        QCOMPARE(m_proxy->data(index, Qt::DisplayRole).toString(), initial.at(row));
+        QCOMPARE(m_proxy->data(index, Qt::DisplayRole).toString(), initial.at(sourceIndex));
+        sourceIndex += adjustmentValue;
     }
 }