diff --git a/src/wp-admin/js/editor-expand.js b/src/wp-admin/js/editor-expand.js
index 43ef3b12aa..25f86c2847 100644
--- a/src/wp-admin/js/editor-expand.js
+++ b/src/wp-admin/js/editor-expand.js
@@ -600,7 +600,7 @@
 
 			// Adjust when collapsing the menu, changing the columns, changing the body class.
 			$document.on( 'wp-collapse-menu.editor-expand postboxes-columnchange.editor-expand editor-classchange.editor-expand', adjust )
-				.on( 'postbox-toggled.editor-expand', function() {
+				.on( 'postbox-toggled.editor-expand postbox-moved.editor-expand', function() {
 					if ( ! fixedSideTop && ! fixedSideBottom && window.pageYOffset > pinnedToolsTop ) {
 						fixedSideBottom = true;
 						window.scrollBy( 0, -1 );
diff --git a/src/wp-admin/js/postbox.js b/src/wp-admin/js/postbox.js
index 15cdecc923..a8222ee296 100644
--- a/src/wp-admin/js/postbox.js
+++ b/src/wp-admin/js/postbox.js
@@ -139,6 +139,7 @@ var postboxes;
 						$(ui.sender).sortable('cancel');
 
 					postboxes._mark_area();
+					$document.trigger( 'postbox-moved', ui.item );
 				}
 			});