diff --git a/src/widgets/widgets/qcombobox.cpp b/src/widgets/widgets/qcombobox.cpp
index b28bd154c3..fabd4e9eed 100644
--- a/src/widgets/widgets/qcombobox.cpp
+++ b/src/widgets/widgets/qcombobox.cpp
@@ -2098,7 +2098,7 @@ int QComboBox::currentIndex() const
 void QComboBox::setCurrentIndex(int index)
 {
     Q_D(QComboBox);
-    QModelIndex mi = d->model->index(index, d->modelColumn, d->root);
+    QModelIndex mi = index >= 0 ? d->model->index(index, d->modelColumn, d->root) : QModelIndex();
     d->setCurrentIndex(mi);
 }