diff --git a/phpBB/phpbb/auth/provider/base.php b/phpBB/phpbb/auth/provider/base.php
index 2f1bf8f601..09e918cee4 100644
--- a/phpBB/phpbb/auth/provider/base.php
+++ b/phpBB/phpbb/auth/provider/base.php
@@ -101,4 +101,12 @@ abstract class phpbb_auth_provider_base implements phpbb_auth_provider_interface
 	{
 		return;
 	}
+
+	/**
+	* {@inheritdoc}
+	*/
+	public function unlink_account(array $link_data)
+	{
+		return;
+	}
 }
diff --git a/phpBB/phpbb/auth/provider/interface.php b/phpBB/phpbb/auth/provider/interface.php
index 21526fd858..4abbd75055 100644
--- a/phpBB/phpbb/auth/provider/interface.php
+++ b/phpBB/phpbb/auth/provider/interface.php
@@ -166,4 +166,12 @@ interface phpbb_auth_provider_interface
 	*								an external account.
 	*/
 	public function link_account(array $link_data);
+
+	/**
+	* Unlinks an external account from a phpBB account.
+	*
+	* @param	array	$link_data	Any data needed to unlink a phpBB account
+	*								from a phpbb account.
+	*/
+	public function unlink_account(array $link_data);
 }