diff --git a/src/plugins/platformthemes/gtk2/qgtk2dialoghelpers.cpp b/src/plugins/platformthemes/gtk2/qgtk2dialoghelpers.cpp
index 62e5dd2..3e609f7 100644
--- a/src/plugins/platformthemes/gtk2/qgtk2dialoghelpers.cpp
+++ b/src/plugins/platformthemes/gtk2/qgtk2dialoghelpers.cpp
@@ -38,6 +38,7 @@
 #include <qcolor.h>
 #include <qdebug.h>
 #include <qfont.h>
+#include <qfileinfo.h>
 
 #include <private/qguiapplication_p.h>
 #include <qpa/qplatformfontdatabase.h>
@@ -50,6 +51,16 @@
 
 QT_BEGIN_NAMESPACE
 
+// GTK file chooser image preview: thanks to Chromium
+
+// The size of the preview we display for selected image files. We set height
+// larger than width because generally there is more free space vertically
+// than horiztonally (setting the preview image will alway expand the width of
+// the dialog, but usually not the height). The image's aspect ratio will always
+// be preserved.
+#define PREVIEW_WIDTH 256
+#define PREVIEW_HEIGHT 512
+
 class QGtk2Dialog : public QWindow
 {
     Q_OBJECT
@@ -70,18 +81,24 @@ Q_SIGNALS:
 
 protected:
     static void onResponse(QGtk2Dialog *dialog, int response);
+    static void onUpdatePreview(QGtk2Dialog *dialog);
 
 private slots:
     void onParentWindowDestroyed();
 
 private:
     GtkWidget *gtkWidget;
+    GtkWidget *previewWidget;
 };
 
 QGtk2Dialog::QGtk2Dialog(GtkWidget *gtkWidget) : gtkWidget(gtkWidget)
 {
     g_signal_connect_swapped(G_OBJECT(gtkWidget), "response", G_CALLBACK(onResponse), this);
     g_signal_connect(G_OBJECT(gtkWidget), "delete-event", G_CALLBACK(gtk_widget_hide_on_delete), NULL);
+
+    previewWidget = gtk_image_new();
+    g_signal_connect_swapped(G_OBJECT(gtkWidget), "update-preview", G_CALLBACK(onUpdatePreview), this);
+    gtk_file_chooser_set_preview_widget(GTK_FILE_CHOOSER(gtkWidget), previewWidget);
 }
 
 QGtk2Dialog::~QGtk2Dialog()
@@ -151,6 +168,32 @@ void QGtk2Dialog::onResponse(QGtk2Dialog *dialog, int response)
         emit dialog->reject();
 }
 
+void QGtk2Dialog::onUpdatePreview(QGtk2Dialog *dialog) {
+    gchar *filename = gtk_file_chooser_get_preview_filename(GTK_FILE_CHOOSER(dialog->gtkWidget));
+    if (!filename) {
+        gtk_file_chooser_set_preview_widget_active(GTK_FILE_CHOOSER(dialog->gtkWidget), false);
+        return;
+    }
+
+    // Don't attempt to open anything which isn't a regular file. If a named pipe,
+    // this may hang. See https://crbug.com/534754.
+    QFileInfo fileinfo(filename);
+    if (!fileinfo.exists() || !fileinfo.isFile()) {
+        g_free(filename);
+        gtk_file_chooser_set_preview_widget_active(GTK_FILE_CHOOSER(dialog->gtkWidget), false);
+        return;
+    }
+
+    // This will preserve the image's aspect ratio.
+    GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file_at_size(filename, PREVIEW_WIDTH, PREVIEW_HEIGHT, 0);
+    g_free(filename);
+    if (pixbuf) {
+        gtk_image_set_from_pixbuf(GTK_IMAGE(dialog->previewWidget), pixbuf);
+        g_object_unref(pixbuf);
+    }
+    gtk_file_chooser_set_preview_widget_active(GTK_FILE_CHOOSER(dialog->gtkWidget), pixbuf ? true : false);
+}
+
 void QGtk2Dialog::onParentWindowDestroyed()
 {
     // The QGtk2*DialogHelper classes own this object. Make sure the parent doesn't delete it.