diff --git a/src/widgets/itemviews/qtreeview.cpp b/src/widgets/itemviews/qtreeview.cpp
index b339fe0f3b..b534de5c6a 100644
--- a/src/widgets/itemviews/qtreeview.cpp
+++ b/src/widgets/itemviews/qtreeview.cpp
@@ -3724,9 +3724,14 @@ void QTreeViewPrivate::updateScrollBars()
 
 int QTreeViewPrivate::itemDecorationAt(const QPoint &pos) const
 {
+    Q_Q(const QTreeView);
     executePostedLayout();
-    int x = pos.x();
-    int column = header->logicalIndexAt(x);
+    bool spanned = false;
+    if (!spanningIndexes.isEmpty()) {
+        const QModelIndex index = q->indexAt(pos);
+        spanned = q->isFirstColumnSpanned(index.row(), index.parent());
+    }
+    const int column = spanned ? 0 : header->logicalIndexAt(pos.x());
     if (!isTreePosition(column))
         return -1; // no logical index at x