diff --git a/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentmap.cpp b/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentmap.cpp
index 9cf82c786a..8424dbe97d 100644
--- a/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentmap.cpp
+++ b/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentmap.cpp
@@ -172,9 +172,10 @@ QFuture<QImage> thumbNails =
 
 //! [13]
 QList<QImage> images = ...;
-QFuture<QImage> thumbnails = QtConcurrent::mapped(images, [](const QImage &img) {
+std::function<QImage(const QImage &)> scale = [](const QImage &img) {
     return img.scaledToWidth(100, Qt::SmoothTransformation);
-});
+};
+QFuture<QImage> thumbnails = QtConcurrent::mapped(images, scale);
 //! [13]
 
 //! [14]