diff --git a/core/modules/block/block.module b/core/modules/block/block.module
index 8fa59ea..011d723 100644
--- a/core/modules/block/block.module
+++ b/core/modules/block/block.module
@@ -359,6 +359,36 @@ function _block_rehash($theme = NULL) {
 }
 
 /**
+ * Provides block comparison function.
+ *
+ * @param $first
+ *   First block object to compare.
+ *
+ * @param $second
+ *   Second block object to compare.
+ */
+function _block_cmp($first, $second) {
+
+  // Compare weight first.
+  if ($first->weight < $second->weight) {
+    return -1;
+  }
+  else if ($first->weight > $second->weight) {
+    return 1;
+  }
+
+  // Compare id in the reverse order then.
+  if ($first->id < $second->id) {
+    return 1;
+  }
+  else if ($first->id > $second->id) {
+    return -1;
+  }
+
+  return 0;
+}
+
+/**
  * Initializes blocks for enabled themes.
  *
  * @param $theme_list
@@ -431,9 +461,7 @@ function block_list($region) {
     $blocks[$region] = array();
   }
 
-  uasort($blocks[$region], function($first, $second) {
-    return $first->weight === $second->weight ? 0 : ($first->weight < $second->weight ? -1 : 1);
-  });
+  uasort($blocks[$region], '_block_cmp');
 
   return $blocks[$region];
 }
diff --git a/core/modules/block/lib/Drupal/block/BlockListController.php b/core/modules/block/lib/Drupal/block/BlockListController.php
index 03e3462..03de10d 100644
--- a/core/modules/block/lib/Drupal/block/BlockListController.php
+++ b/core/modules/block/lib/Drupal/block/BlockListController.php
@@ -101,7 +101,8 @@ public function load() {
     // @todo Move the functionality of _block_rehash() out of the listing page.
     $entities = _block_rehash($this->theme);
 
-    uasort($entities, array($this->entityInfo['class'], 'sort'));
+    uasort($entities, '_block_cmp');
+
     return $entities;
   }