diff --git a/upgrade.php b/upgrade.php
index bb71bd23..30bc6505 100644
--- a/upgrade.php
+++ b/upgrade.php
@@ -1376,10 +1376,14 @@ function upgrade_1762() {
     _db_add_field('fetchmail', 'modified', '{DATECURRENT}',                    'created');
 }
 
-function upgrade_1763() {
+function upgrade_1763_mysql() {
     $table = table_by_key('fetchmail');
     db_query_parsed("UPDATE $table SET domain=SUBSTRING_INDEX(mailbox, '@', -1) WHERE domain='';");
 }
+function upgrade_1763_pgsql() {
+    $table = table_by_key('fetchmail');
+    db_query_parsed("UPDATE $table SET domain=SPLIT_PART(mailbox, '@', 2) WHERE domain='';");
+}
 
 function upgrade_1767() {
     # 'active' was just added, so make sure all existing jobs stay active