diff --git a/install/sql/mysql.sql b/install/sql/mysql.sql
index 88cdfdfc1..2289f21e9 100644
--- a/install/sql/mysql.sql
+++ b/install/sql/mysql.sql
@@ -928,6 +928,7 @@ CREATE TABLE IF NOT EXISTS `bb_posts`
   `post_edit_time`  INT(11)               NOT NULL DEFAULT '0',
   `post_edit_count` SMALLINT(5) UNSIGNED  NOT NULL DEFAULT '0',
   `post_attachment` TINYINT(1)            NOT NULL DEFAULT '0',
+  `post_pinned`     TINYINT(1)            NOT NULL DEFAULT '0',
   `user_post`       TINYINT(1)            NOT NULL DEFAULT '1',
   `mc_comment`      TEXT                  NOT NULL DEFAULT '',
   `mc_type`         TINYINT(1)            NOT NULL DEFAULT '0',
@@ -945,7 +946,7 @@ CREATE TABLE IF NOT EXISTS `bb_posts`
 -- Records of bb_posts
 -- ----------------------------
 INSERT INTO `bb_posts`
-VALUES ('1', '1', '1', '2', UNIX_TIMESTAMP(), '0', '0', '0', '', '0', '0', '0', '1', '', '0', '0');
+VALUES ('1', '1', '1', '2', UNIX_TIMESTAMP(), '0', '0', '0', '', '0', '0', '0', '0', '1', '', '0', '0');
 
 -- ----------------------------
 -- Table structure for `bb_posts_html`
diff --git a/library/ajax/posts.php b/library/ajax/posts.php
index 54ba9da87..0af51fd15 100644
--- a/library/ajax/posts.php
+++ b/library/ajax/posts.php
@@ -65,9 +65,11 @@ switch ($this->request['type']) {
         }
         break;
 
+    case 'unpin':
     case 'pin':
         if ($post['post_id'] != $post['topic_first_post_id'] && (($userdata['user_id'] == $post['poster_id']) || $is_auth['auth_mod'])) {
-
+            $action = $this->request['type'] == 'unpin' ? 0 : 1;
+            DB()->query("UPDATE " . BB_POSTS . " SET post_pinned = $action WHERE post_id = $post_id LIMIT 1");
         } else {
             // TODO
         }