diff --git a/wwwroot/inc/popup.php b/wwwroot/inc/popup.php
index 15244cb..a556b90 100644
--- a/wwwroot/inc/popup.php
+++ b/wwwroot/inc/popup.php
@@ -353,7 +353,7 @@ function renderPopupPortSelector()
 	assertUIntArg ('port');
 	$port_id = $_REQUEST['port'];
 	$port_info = getPortInfo ($port_id);
-	$in_rack = isset ($_REQUEST['in_rack']);
+	$in_rack = $_REQUEST['in_rack'] != 'off';
 
 	// fill port filter structure
 	$filter = array
@@ -391,7 +391,7 @@ function renderPopupPortSelector()
 	echo '<table align="center" valign="bottom"><tr>';
 	echo '<td class="tdleft"><label>Object name:<br><input type=text size=8 name="filter-obj" value="' . htmlspecialchars ($filter['objects'], ENT_QUOTES) . '"></label></td>';
 	echo '<td class="tdleft"><label>Port name:<br><input type=text size=6 name="filter-port" value="' . htmlspecialchars ($filter['ports'], ENT_QUOTES) . '"></label></td>';
-	echo '<td class="tdleft" valign="bottom"><label><input type=checkbox name="in_rack"' . ($in_rack ? ' checked' : '') . '>Nearest racks</label></td>';
+	echo '<td class="tdleft" valign="bottom"><input type="hidden" name="in_rack" value="off" /><label><input type=checkbox name="in_rack"' . ($in_rack ? ' checked' : '') . '>Nearest racks</label></td>';
 	echo '<td valign="bottom"><input type=submit value="show ports"></td>';
 	echo '</tr></table>';
 	finishPortlet();