diff --git a/packages/backend/src/misc/secure-rndstr.ts b/packages/backend/src/misc/secure-rndstr.ts
index 7853100d89..709e584ccb 100644
--- a/packages/backend/src/misc/secure-rndstr.ts
+++ b/packages/backend/src/misc/secure-rndstr.ts
@@ -14,11 +14,8 @@ export function secureRndstr(length = 32, { chars = LU_CHARS } = {}): string {
 	let str = '';
 
 	for (let i = 0; i < length; i++) {
-		let rand = Math.floor((crypto.randomBytes(1).readUInt8(0) / 0xFF) * chars_len);
-		if (rand === chars_len) {
-			rand = chars_len - 1;
-		}
-		str += chars.charAt(rand);
+	    const rand = crypto.randomInt(0, chars_len);
+	    str += chars.charAt(rand);
 	}
 
 	return str;