diff --git a/admin/derivatives_build.php b/admin/derivatives_build.php
deleted file mode 100644
index 374abbcfd..000000000
--- a/admin/derivatives_build.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-// +-----------------------------------------------------------------------+
-// | Piwigo - a PHP based photo gallery                                    |
-// +-----------------------------------------------------------------------+
-// | Copyright(C) 2008-2012 Piwigo Team                  http://piwigo.org |
-// | Copyright(C) 2003-2008 PhpWebGallery Team    http://phpwebgallery.net |
-// | Copyright(C) 2002-2003 Pierrick LE GALL   http://le-gall.net/pierrick |
-// +-----------------------------------------------------------------------+
-// | This program is free software; you can redistribute it and/or modify  |
-// | it under the terms of the GNU General Public License as published by  |
-// | the Free Software Foundation                                          |
-// |                                                                       |
-// | This program is distributed in the hope that it will be useful, but   |
-// | WITHOUT ANY WARRANTY; without even the implied warranty of            |
-// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      |
-// | General Public License for more details.                              |
-// |                                                                       |
-// | You should have received a copy of the GNU General Public License     |
-// | along with this program; if not, write to the Free Software           |
-// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
-// | USA.                                                                  |
-// +-----------------------------------------------------------------------+
-
-defined('PHPWG_ROOT_PATH') or trigger_error('Hacking attempt!', E_USER_ERROR);
-
-$template->assign('derivatives', array_keys(ImageStdParams::get_defined_type_map()));
-
-$template->set_filename('derivatives', 'derivatives_build.tpl');
-$template->assign_var_from_handle('ADMIN_CONTENT', 'derivatives');
-?>
\ No newline at end of file
diff --git a/admin/themes/default/template/derivatives.tpl b/admin/themes/default/template/derivatives.tpl
index dcf52a4ec..59f6344a7 100644
--- a/admin/themes/default/template/derivatives.tpl
+++ b/admin/themes/default/template/derivatives.tpl
@@ -22,7 +22,6 @@
 </style>
 {/literal}{/html_head}
 
-<p><a href="admin.php?page=derivatives_build">Build missing derivatives</a></p>
 <form method="post" id="derviativesForm">
 <fieldset>
 <legend>{'Watermark'|@translate}</legend>
diff --git a/admin/themes/default/template/derivatives_build.tpl b/admin/themes/default/template/derivatives_build.tpl
deleted file mode 100644
index 16170a65e..000000000
--- a/admin/themes/default/template/derivatives_build.tpl
+++ /dev/null
@@ -1,152 +0,0 @@
-{html_head}{literal}
-<style type="text/css">
-TABLE {
-	font-size: larger;
-}
-</style>
-{/literal}{/html_head}
-
-<p>
-	<select id="types" name="types[]" multiple="multiple">
-	{foreach from=$derivatives item=type}
-	<option value="{$type}" selected="selected">{$type|@translate}</option>
-	{/foreach}
-	</select>
-	<input id="startLink" value="{'Start'|@translate}" onclick="start()" type="button">
-	<input id="pauseLink" value="{'Pause'|@translate}" onclick="pause()" type="button" disabled="disbled">
-	<input id="stopLink" value="{'Stop'|@translate}" onclick="stop()" type="button" disabled="disbled">
-</p>
-<hr/>
-<p>
-<table>
-	<tr>
-		<td>Errors</td>
-		<td id="errors">0</td>
-	</tr>
-	<tr>
-		<td>Loaded</td>
-		<td id="loaded">0</td>
-	</tr>
-	<tr>
-		<td>Remaining</td>
-		<td id="remaining">0</td>
-	</tr>
-</table>
-<div id="feedbackWrap" style="height:320px; min-height:320px;">
-<img id="feedbackImg">
-</div>
-</p>
-
-<div id="errorList">
-</div>
-
-{combine_script id='iloader' load='footer' path='themes/default/js/image.loader.js'}
-
-{footer_script require='jquery.effects.slide'}{literal}
-
-var loader = new ImageLoader( {onChanged: loaderChanged, maxRequests:1 } )
-	, pending_next_page = null
-	, last_image_show_time = 0
-	, allDoneDfd, urlDfd;
-
-function start() {
-	allDoneDfd = jQuery.Deferred();
-	urlDfd = jQuery.Deferred();
-
-	allDoneDfd.always( function() {
-			jQuery("#startLink").attr('disabled', false).css("opacity", 1);
-			jQuery("#pauseLink,#stopLink").attr('disabled', true).css("opacity", 0.5);
-		} );
-
-	urlDfd.always( function() {
-		if (loader.remaining()==0)
-			allDoneDfd.resolve();
-		} );
-
-	jQuery("#startLink").attr('disabled', true).css("opacity", 0.5);
-	jQuery("#pauseLink,#stopLink").attr('disabled', false).css("opacity", 1);
-
-	loader.pause(false);
-	updateStats();
-	getUrls();
-}
-
-function pause() {
-	loader.pause( !loader.pause() );
-}
-
-function stop() {
-	loader.clear();
-	urlDfd.resolve();
-}
-
-function getUrls(page_token) {
-	data = {max_urls: 500, types: []};
-	jQuery.each(jQuery("#types").serializeArray(), function(i, t) {
-			data.types.push( t.value );
-		} );
-
-	if (page_token)
-		data['prev_page'] = page_token;
-	jQuery.post( '{/literal}{$ROOT_URL}{literal}ws.php?format=json&method=pwg.getMissingDerivatives',
-		data, wsData, "json").fail( wsError );
-}
-
-function wsData(data) {
-	if (!data.stat || data.stat != "ok") {
-		wsError();
-		return;
-	}
-	loader.add( data.result.urls );
-	if (data.result.next_page) {
-		if (loader.pause() || loader.remaining() > 100) {
-			pending_next_page = data.result.next_page;
-		}
-		else {
-			getUrls(data.result.next_page);
-		}
-	}
-}
-
-function wsError() {
-	urlDfd.reject();
-}
-
-function updateStats() {
-	jQuery("#loaded").text( loader.loaded );
-	jQuery("#errors").text( loader.errors );
-	jQuery("#remaining").text( loader.remaining() );
-}
-
-function loaderChanged(type, img) {
-	updateStats();
-	if (img) {
-		if (type==="load") {
-			var now = jQuery.now();
-			if (now - last_image_show_time > 3000) {
-				last_image_show_time = now;
-				var h=img.height, url=img.src;
-				jQuery("#feedbackWrap").hide("slide", {direction:'down'}, function() {
-					last_image_show_time = jQuery.now();
-					if (h > 300 )
-						jQuery("#feedbackImg").attr("height", 300);
-					else
-						jQuery("#feedbackImg").removeAttr("height");
-					jQuery("#feedbackImg").attr("src", url);
-					jQuery("#feedbackWrap").show("slide", {direction:'up'} );
-					} );
-			}
-		}
-		else {
-			jQuery("#errorList").prepend( '<a href="'+img.src+'">'+img.src+'</a>' + "<br>");
-		}
-	}
-	if (pending_next_page && 100 > loader.remaining() )	{
-		getUrls(pending_next_page);
-		pending_next_page = null;
-	}
-	else if (loader.remaining() == 0 && (urlDfd.isResolved() || urlDfd.isRejected()))	{
-		allDoneDfd.resolve();
-	}
-}
-{/literal}{/footer_script}
\ No newline at end of file