diff --git a/application/Espo/ORM/QueryComposer/PostgresqlQueryComposer.php b/application/Espo/ORM/QueryComposer/PostgresqlQueryComposer.php
index d9288021f2..c87852d2e0 100644
--- a/application/Espo/ORM/QueryComposer/PostgresqlQueryComposer.php
+++ b/application/Espo/ORM/QueryComposer/PostgresqlQueryComposer.php
@@ -333,7 +333,7 @@ class PostgresqlQueryComposer extends BaseQueryComposer
                     return "EXTRACT(YEAR FROM $to - $from)";
 
                 case 'TIMESTAMPDIFF_MONTH':
-                    return "EXTRACT(MONTH FROM $to) - $from)";
+                    return "EXTRACT(MONTH FROM $to - $from)";
 
                 case 'TIMESTAMPDIFF_WEEK':
                     return "FLOOR(EXTRACT(DAY FROM $to - $from) / 7)";