diff --git a/src/util.ts b/src/util.ts
index 6f058eed..205589fe 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -117,7 +117,7 @@ export function getRandomInt(min: number, max: number) {
 export function getCryptoRandomInt(min: number, max: number) {
     const randomBuffer = new Uint32Array(1);
     crypto.getRandomValues(randomBuffer);
-    let randomNumber = randomBuffer[0] / (0xffffffff + 1);
+    const randomNumber = randomBuffer[0] / (0xffffffff + 1);
     min = Math.ceil(min);
     max = Math.floor(max);
     return Math.floor(randomNumber * (max - min + 1)) + min;