diff --git a/config/filter.d/nextcloud-common.conf b/config/filter.d/nextcloud-common.conf
index 749329d5..14cb001f 100644
--- a/config/filter.d/nextcloud-common.conf
+++ b/config/filter.d/nextcloud-common.conf
@@ -25,4 +25,4 @@ nextcloud-prefix = <nextcloud-prefix-<logging>>
 # based on https://docs.nextcloud.com/server/27/admin_manual/installation/harden_server.html#setup-a-filter-and-a-jail-for-nextcloud
 _groupsre = (?:(?:,?\s*"\w+":(?:"(?:[^"\\]|\\.)*"|\w+))*)
 
-datepattern = ^%(nextcloud-prefix)s?\{%(_groupsre)s,?\s*"time"\s*:\s*"%%Y-%%m-%%d[T ]%%H:%%M:%%S(%%z)?"
+datepattern = ^%(nextcloud-prefix)s\{%(_groupsre)s,?\s*"time"\s*:\s*"%%Y-%%m-%%d[T ]%%H:%%M:%%S(%%z)?"