diff --git a/src/util.ts b/src/util.ts
index 6fdfc3be..8ba53738 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -114,7 +114,7 @@ export function getRandomInt(min: number, max: number) {
     return Math.floor(Math.random() * (max - min + 1)) + min;
 }
 
-export function getCryptoRandomInt(min, max) {
+export function getCryptoRandomInt(min; number, max: number) {
     const randomBuffer = new Uint32Array(1);
     crypto.getRandomValues(randomBuffer);
     let randomNumber = randomBuffer[0] / (0xffffffff + 1);