diff --git a/etc/inc/vpn.inc b/etc/inc/vpn.inc
index e65708a11c..2bdfda1278 100644
--- a/etc/inc/vpn.inc
+++ b/etc/inc/vpn.inc
@@ -1399,6 +1399,7 @@ EOD;
 				if (isset ($pppoecfg['radius']['accounting'])) {
 					$mpdconf .=<<<EOD
 	set auth enable radius-acct
+	set radius acct-update 300
 
 EOD;
 				}
@@ -1590,6 +1591,7 @@ EOD;
 				if (isset ($l2tpcfg['radius']['accounting'])) {
 					$mpdconf .=<<<EOD
 	set auth enable radius-acct
+	set radius acct-update 300
 
 EOD;
 				}