diff --git a/contribution/type/base.php b/contribution/type/base.php
index 1197c785c..4a98cf2da 100644
--- a/contribution/type/base.php
+++ b/contribution/type/base.php
@@ -175,6 +175,13 @@ class base implements type_interface
 	public $forum_database = 0;
 	public $forum_robot = 0;
 
+	/**
+	 * Author profile field used to store the contribution count.
+	 *
+	 * @var string|null
+	 */
+	public $author_count;
+
 	/**
 	 * Array of available licenses for this type of contribution
 	 *