diff --git a/core/modules/forum/forum.services.yml b/core/modules/forum/forum.services.yml
new file mode 100644
index 0000000..ff9f695
--- /dev/null
+++ b/core/modules/forum/forum.services.yml
@@ -0,0 +1,5 @@
+services:
+  forum.breadcrumb:
+    class: Drupal\forum\ForumBreadcrumbBuilder
+    tags:
+      - { name: breadcrumb_builder, priority: 1001 }
diff --git a/core/modules/forum/lib/Drupal/forum/ForumBreadcrumbBuilder.php b/core/modules/forum/lib/Drupal/forum/ForumBreadcrumbBuilder.php
new file mode 100644
index 0000000..3ee7df1
--- /dev/null
+++ b/core/modules/forum/lib/Drupal/forum/ForumBreadcrumbBuilder.php
@@ -0,0 +1,101 @@
+<?php
+
+/**
+ * @file
+ * Definition of Drupal\forum\ForumBreadcrumbBuilder.
+ */
+
+namespace Drupal\forum;
+
+use Drupal\Core\Breadcrumb\BreadcrumbBuilderInterface;
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * Class to define the forum breadcrumb builder.
+ */
+class ForumBreadcrumbBuilder implements BreadcrumbBuilderInterface {
+
+  /**
+   * Implements \Drupal\Breadcrumb\BreadcrumbBuilderInterface::build().
+   *
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The HttpRequest object representing the current request.
+   *
+   * @return array|FALSE|NULL
+   *   A render array for the breacrumbs, or
+   *   FALSE, to suppress breadcrumbs on this page, or
+   *   NULL, to let other builders decide.
+   */
+  public function build(Request $request) {
+
+    if ($request->attributes->has('drupal_menu_item')) {
+      $item = $request->attributes->get('drupal_menu_item');
+      switch ($item['path']) {
+
+        case 'node/%':
+          $node = $item['map'][1];
+          // Load the object in case of missing wildcard loaders.
+          $node = is_object($node) ? $node : node_load($node);
+          if (_forum_node_check_node_type($node)) {
+            $breadcrumb = $this->forumPostBreadcrumb($node);
+          }
+          break;
+
+        case 'forum/%':
+          $term = $item['map'][1];
+          // Load the object in case of missing wildcard loaders.
+          $term = is_object($term) ? $term : forum_forum_load($term);
+          $breadcrumb = $this->forumTermBreadcrumb($term);
+          break;
+      }
+    }
+
+    if (!empty($breadcrumb)) {
+      return array(
+        '#theme' => 'breadcrumb',
+        '#breadcrumb' => $breadcrumb,
+      );
+    }
+  }
+
+  /**
+   * Builds the breadcrumb for a forum post page.
+   */
+  protected function forumPostBreadcrumb($node) {
+    $config = config('forum.settings');
+    $vocabulary = entity_load('taxonomy_vocabulary', $config->get('vocabulary'));
+
+    $breadcrumb[] = l(t('Home'), NULL);
+    $breadcrumb[] = l($vocabulary->name, 'forum');
+    if ($parents = taxonomy_term_load_parents_all($node->forum_tid)) {
+      $parents = array_reverse($parents);
+      foreach ($parents as $parent) {
+        $breadcrumb[] = l($parent->label(), 'forum/' . $parent->tid);
+      }
+    }
+    return $breadcrumb;
+  }
+
+  /**
+   * Builds the breadcrumb for a forum term page.
+   */
+  protected function forumTermBreadcrumb($term) {
+    $config = config('forum.settings');
+    $vocabulary = entity_load('taxonomy_vocabulary', $config->get('vocabulary'));
+
+    $breadcrumb[] = l(t('Home'), NULL);
+    if ($term->tid) {
+      // Parent of all forums is the vocabulary name.
+      $breadcrumb[] = l($vocabulary->label(), 'forum');
+    }
+    // Add all parent forums to breadcrumbs.
+    if ($term->parents) {
+      foreach (array_reverse($term->parents) as $parent) {
+        if ($parent->id() != $term->tid) {
+          $breadcrumb[] = l($parent->label(), 'forum/' . $parent->id());
+        }
+      }
+    }
+    return $breadcrumb;
+  }
+}