diff -uNrp zabbix-2.2.3_org/src/zabbix_agent/logfiles.c zabbix-2.2.3/src/zabbix_agent/logfiles.c
--- zabbix-2.2.3_org/src/zabbix_agent/logfiles.c	2014-05-22 17:15:14.111468198 +0900
+++ zabbix-2.2.3/src/zabbix_agent/logfiles.c	2014-05-22 17:17:22.659569004 +0900
@@ -934,6 +934,7 @@ int	process_log(char *filename, zbx_uint
 	{
 		/* The file size has not changed. Nothing to do. Here we do not deal with a case of changing */
 		/* a logfile's content while keeping the same length. */
+		*mtime = (int)buf.st_mtime;
 		ret = SUCCEED;
 		goto out;
 	}