diff --git a/core/modules/block/block.module b/core/modules/block/block.module
index 0412c75..4f5f0aa 100644
--- a/core/modules/block/block.module
+++ b/core/modules/block/block.module
@@ -330,7 +330,7 @@ function block_page_build(&$page) {
   $all_regions = system_region_list($theme);
 
   $item = menu_get_item();
-  if ($item['path'] != 'admin/structure/block/demo/' . $theme) {
+  if ($item['path'] != 'admin/structure/block/demo/%') {
     // Load all region content assigned via blocks.
     foreach (array_keys($all_regions) as $region) {
       // Assign blocks to region.
@@ -350,8 +350,7 @@ function block_page_build(&$page) {
   }
   else {
     // Append region description if we are rendering the regions demo page.
-    $item = menu_get_item();
-    if ($item['path'] == 'admin/structure/block/demo/' . $theme) {
+    if ($item['path'] == 'admin/structure/block/demo/%') {
       $visible_regions = array_keys(system_region_list($theme, REGIONS_VISIBLE));
       foreach ($visible_regions as $region) {
         $description = '<div class="block-region">' . $all_regions[$region] . '</div>';