diff --git a/modules/compute.js b/modules/compute.js
index e96a660..b0dc7d3 100644
--- a/modules/compute.js
+++ b/modules/compute.js
@@ -39,7 +39,7 @@ function modpow(base, exponent, modulus) {
 	let result = 1n;
 	base %= modulus;
 
-	while (exponent > 0) {
+	while (exponent > 0n) {
 		if (exponent % 2n === 1n) {
 			result *= base;
 			result %= modulus;