diff --git a/.htaccess b/.htaccess
index aec5942d5..54250420b 100644
--- a/.htaccess
+++ b/.htaccess
@@ -8,7 +8,7 @@ Options -Indexes
 	RewriteCond %{REQUEST_FILENAME} !-d
 	RewriteCond %{REQUEST_FILENAME} !-f
 	RewriteRule ^client/img/([a-zA-Z_]*)/([a-zA-Z_]*)/([a-zA-Z0-9_\.]*)$ server/php/image.php?size=$1&model=$2&filename=$3 [L]
-	RewriteRule ^ical/([0-9]*)/([a-zA-Z0-9]*).ics$ server/php/ical.php?id=$1&hash=$2 [L]
+	RewriteRule ^ical/([0-9]*)/([0-9]*)/([a-zA-Z0-9]*).ics$ server/php/ical.php?id=$1&user_id=$2&hash=$2 [L]
 	RewriteRule ^download/([0-9]*)/([a-zA-Z0-9_\.]*)$ server/php/download.php?id=$1&hash=$2 [QSA,L]
 	RewriteRule ^oauth_callback/([a-zA-Z0-9_\.]*)/([a-zA-Z0-9_\.]*)$ server/php/oauth_callback.php?plugin=$1&code=$2 [L]
 	RewriteRule ^oauth/authorize$ server/php/authorize.php [QSA,L]