diff --git a/phpstan.neon b/phpstan.neon
index 5f7869e1..4cea516c 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -9,3 +9,4 @@ parameters:
     - '#Undefined variable: \$this.*#'
     - '/Variable \$api_errors might not be defined./'
     - '/Variable \$registry might not be defined./'
+    - 'Parameter #3 $mode of function round expects 1|2|3|4, int given.'
diff --git a/src/flextype/core/Parsers/Expressions/MathExpression.php b/src/flextype/core/Parsers/Expressions/MathExpression.php
index 35e33fe2..5a17b3c4 100644
--- a/src/flextype/core/Parsers/Expressions/MathExpression.php
+++ b/src/flextype/core/Parsers/Expressions/MathExpression.php
@@ -25,24 +25,13 @@ use const PHP_ROUND_HALF_UP;
 use const PHP_ROUND_HALF_DOWN;
 use const PHP_ROUND_HALF_ODD;
 
-/**
- * @phpstan-param self::ROUND_* $mode
- */
 class MathExpression implements ExpressionFunctionProviderInterface
 {
-    public const ROUND_HALF_EVEN = PHP_ROUND_HALF_EVEN;
-	public const ROUND_HALF_DOWN = PHP_ROUND_HALF_DOWN;
-	public const ROUND_HALF_ODD = PHP_ROUND_HALF_ODD;
-	public const ROUND_HALF_UP = PHP_ROUND_HALF_UP;
-
-    /**
-	 * @phpstan-param self::ROUND_* $mode
-	 */
     public function getFunctions()
     {
         return [
             new ExpressionFunction('abs', static fn (int|float $num) => '\abs($num)', static fn (array $arguments, int|float $num): mixed => \abs($num)),
-            new ExpressionFunction('round', static fn (int|float $num, int $precision = 0, int $mode = self::PHP_ROUND_HALF_UP): mixed => '\round($num, $precision, $mode)', static fn (array $arguments, int|float $num, int $precision = 0, int $mode = self::PHP_ROUND_HALF_UP): mixed => \round($num, $precision, $mode)),
+            new ExpressionFunction('round', static fn (int|float $num, int $precision = 0, int $mode = PHP_ROUND_HALF_UP): mixed => '\round($num, $precision, $mode)', static fn (array $arguments, int|float $num, int $precision = 0, int $mode = PHP_ROUND_HALF_UP): mixed => \round($num, $precision, $mode)),
             new ExpressionFunction('ceil', static fn (int|float $num) => '\ceil($num)', static fn (array $arguments, int|float $num): mixed => \ceil($num)),
             new ExpressionFunction('floor', static fn (int|float $num) => '\floor($num)', static fn (array $arguments, int|float $num): mixed => \floor($num)),
             new ExpressionFunction('min', static fn (mixed ...$values) => '\min($values)', static fn (array $arguments, mixed ...$values): mixed => \min($values)),