diff --git a/config/filter.d/kerio.conf b/config/filter.d/kerio.conf
index e7ca0a01..33779950 100644
--- a/config/filter.d/kerio.conf
+++ b/config/filter.d/kerio.conf
@@ -8,7 +8,7 @@ failregex = ^ SMTP Spam attack detected from <HOST>,
             ^ Attempt to deliver to unknown recipient \S+, from \S+, IP address <HOST>$
 [Init]
 
-datepattern = ^[%%d/%%b/%%Y %%H:%%M:%%S]
+datepattern = ^\[%%d/%%b/%%Y %%H:%%M:%%S\]
 
 # DEV NOTES:
 #