Index: imagefield_crop.js
===================================================================
--- imagefield_crop.js	(revision 1380)
+++ imagefield_crop.js	(working copy)
@@ -45,6 +45,7 @@
         aspectRatio: Drupal.settings.imagefield_crop[id].box.ratio,
         boxWidth: Drupal.settings.imagefield_crop[id].box.box_width,
         boxHeight: Drupal.settings.imagefield_crop[id].box.box_height,
+        minSize: [Drupal.settings.imagefield_crop[id].preview.width, Drupal.settings.imagefield_crop[id].preview.height],
         setSelect: [
           parseInt($(".edit-image-crop-x", widget).val()),
           parseInt($(".edit-image-crop-y", widget).val()),