diff --git a/library/ajax/posts.php b/library/ajax/posts.php
index 08bcd77e..cfed7431 100644
--- a/library/ajax/posts.php
+++ b/library/ajax/posts.php
@@ -89,7 +89,7 @@ switch($this->request['type'])
 		// hide user passkey
 		$message = preg_replace('#(?<=\?' . $bb_cfg['passkey_key'] . '=)[a-zA-Z0-9]{' . BT_AUTH_KEY_LENGTH . '}(?=&)#', 'passkey', $message);
 		// hide sid
-		$message = preg_replace('#(?<=[\?&;]sid=)[a-zA-Z0-9]{12}#', 'sid', $message);
+		$message = preg_replace('#(?<=[\?&;]sid=)[a-zA-Z0-9]{' . SID_LENGTH . '}#', 'sid', $message);
 
 		if (!empty($orig_word))
 		{
diff --git a/posting.php b/posting.php
index 99e73bd0..aaddb395 100644
--- a/posting.php
+++ b/posting.php
@@ -555,7 +555,7 @@ else
 			// hide user passkey
 			$message = preg_replace('#(?<=\?' . $bb_cfg['passkey_key'] . '=)[a-zA-Z0-9]{' . BT_AUTH_KEY_LENGTH . '}(?=&)#', 'passkey', $message);
 			// hide sid
-			$message = preg_replace('#(?<=[\?&;]sid=)[a-zA-Z0-9]{12}#', 'sid', $message);
+			$message = preg_replace('#(?<=[\?&;]sid=)[a-zA-Z0-9]{' . SID_LENGTH . '}#', 'sid', $message);
 
 			if (!empty($orig_word))
 			{