diff --git a/maths/digit_sum.ts b/maths/digit_sum.ts
index 34be6730..39724081 100644
--- a/maths/digit_sum.ts
+++ b/maths/digit_sum.ts
@@ -9,8 +9,12 @@
*/
export const digitSum = (num: number): number => {
- if (num < 0 || !Number.isInteger(num)) {
- throw new Error('only natural numbers are supported')
+ if (!Number.isInteger(num)) {
+ throw new Error('only integers are supported')
+ }
+
+ if(num < 0) {
+ num *= -1;
}
let sum = 0
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