diff --git a/src/operands.php b/src/operands.php
index 1e3e7b9..4583770 100644
--- a/src/operands.php
+++ b/src/operands.php
@@ -4,7 +4,7 @@
 
 namespace Major\PluralRules\Operands;
 
-function mod(int|float $number, $divisor): int|float
+function mod(int|float $number, int $divisor): float
 {
     return $number % $divisor + $number - round($number);
 }