diff --git a/etc/inc/upgrade_config.inc b/etc/inc/upgrade_config.inc
index 540cf3b241..6282fa56eb 100644
--- a/etc/inc/upgrade_config.inc
+++ b/etc/inc/upgrade_config.inc
@@ -1343,7 +1343,7 @@ function upgrade_051_to_052() {
 			$server['tunnel_network'] = $server['addresspool'];
 			unset($server['addresspool']);
 			if (isset($server['use_lzo'])) {
-				$server['compress'] = true;
+				$server['compression'] = "on";
 				unset($server['use_lzo']);
 			}
 			if ($server['nopool'])
@@ -1439,7 +1439,7 @@ function upgrade_051_to_052() {
 			$client['proxy_addr'] = $client['poxy_hostname'];
 			unset($client['proxy_addr']);
 			if (isset($client['use_lzo'])) {
-				$client['compress'] = true;
+				$client['compression'] = "on";
 				unset($client['use_lzo']);
 			}
 			$client['resolve_retry'] = $client['infiniteresolvretry'];