diff --git a/upgrade.php b/upgrade.php
index 695f2fac..e13d4b97 100644
--- a/upgrade.php
+++ b/upgrade.php
@@ -1118,6 +1118,7 @@ function upgrade_730_pgsql() {
     $table_quota = table_by_key('quota');
     $table_quota2 = table_by_key('quota2');
 
+    db_query_parsed('CREATE LANGUAGE plpgsql', 1); /* will error if plpgsql is already installed */
     # trigger for dovecot v1.0 & 1.1 quota table
     # taken from http://wiki.dovecot.org/Quota/Dict
     db_query_parsed("