diff --git a/src/calibre/gui2/dialogs/trim_image.py b/src/calibre/gui2/dialogs/trim_image.py
index c6842fc3db..26257bb0ba 100644
--- a/src/calibre/gui2/dialogs/trim_image.py
+++ b/src/calibre/gui2/dialogs/trim_image.py
@@ -134,6 +134,7 @@ class TrimImage(QDialog):
         if d.exec() == QDialog.DialogCode.Accepted:
             width, height = d.selection_size
             self.canvas.set_selection_size_in_image_coords(width, height)
+            self.selection_changed(True)
 
     def do_trim(self):
         self.canvas.trim_image()