diff --git a/install/patches/upd_dev_collection.php b/install/patches/upd_dev_collection.php
index 5531e88fa915b6b0993aeb48aeeddc15c0d25aa3..304828931e7a10f08f022664c1ab861b94ad4d40 100644
--- a/install/patches/upd_dev_collection.php
+++ b/install/patches/upd_dev_collection.php
@@ -8,7 +8,7 @@ class upd_0094 extends installer_patch_update {
 		global $inst;
 
 		// Remove any duplicate mail_forwardings prior to adding unique key
-		$inst->db->query("DELETE FROM mail_forwarding WHERE forwarding_id NOT IN (SELECT MIN(forwarding_id) FROM mail_forwarding GROUP BY source)");
+		//$inst->db->query("DELETE FROM mail_forwarding WHERE forwarding_id NOT IN (SELECT MIN(forwarding_id) FROM mail_forwarding GROUP BY source)");
 
 		// Remove any duplicate mail_transports prior to adding unique key
 		$inst->db->query("DELETE FROM mail_transport WHERE transport_id NOT IN (SELECT MIN(transport_id) FROM mail_transport GROUP BY domain, server_id)");