diff --git a/src/main/java/com/thealgorithms/maths/HarshadNumber.java b/src/main/java/com/thealgorithms/maths/HarshadNumber.java
index 854e4d555b40..4778dc81b664 100644
--- a/src/main/java/com/thealgorithms/maths/HarshadNumber.java
+++ b/src/main/java/com/thealgorithms/maths/HarshadNumber.java
@@ -15,7 +15,7 @@ public static boolean isHarshad(long n) {
         if (n <= 0) return false;
 
         long t = n;
-        int sumOfDigits = 0;
+        long sumOfDigits = 0;
         while (t > 0) {
             sumOfDigits += t % 10;
             t /= 10;