diff --git a/src/Query/Postgresql/DatePart.php b/src/Query/Postgresql/DatePart.php
index faba0a808..04cecf05f 100644
--- a/src/Query/Postgresql/DatePart.php
+++ b/src/Query/Postgresql/DatePart.php
@@ -22,7 +22,7 @@ public function parse(Parser $parser): void
         $parser->match(Lexer::T_OPEN_PARENTHESIS);
         $this->dateString = $parser->ArithmeticPrimary();
         $parser->match(Lexer::T_COMMA);
-        $this->dateFormat = $parser->ArithmeticPrimary();
+        $this->dateFormat = $parser->ArithmeticExpression();
         $parser->match(Lexer::T_CLOSE_PARENTHESIS);
     }