diff --git a/cjs/dist/index.js b/cjs/dist/index.js
index d3b8f80..c457650 100644
--- a/cjs/dist/index.js
+++ b/cjs/dist/index.js
@@ -14,7 +14,8 @@ async function createChallenge(options) {
         params.set('expires', String(Math.floor(options.expires.getTime() / 1000)));
     }
     let salt = options.salt || (0, helpers_js_1.ab2hex)((0, helpers_js_1.randomBytes)(saltLength));
-    if (params.size) {
+    // params.size doesn't work with Node 16
+    if (Object.keys(Object.fromEntries(params)).length) {
         salt = salt + '?' + params.toString();
     }
     const number = options.number === void 0 ? (0, helpers_js_1.randomInt)(maxnumber) : options.number;
diff --git a/deno_dist/index.ts b/deno_dist/index.ts
index b085d5c..783d600 100644
--- a/deno_dist/index.ts
+++ b/deno_dist/index.ts
@@ -32,7 +32,8 @@ export async function createChallenge(
     params.set('expires', String(Math.floor(options.expires.getTime() / 1000)));
   }
   let salt = options.salt || ab2hex(randomBytes(saltLength));
-  if (params.size) {
+  // params.size doesn't work with Node 16
+  if (Object.keys(Object.fromEntries(params)).length) {
     salt = salt + '?' + params.toString();
   }
   const number =
diff --git a/dist/index.js b/dist/index.js
index fc05a61..04c6ef0 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -11,7 +11,8 @@ export async function createChallenge(options) {
         params.set('expires', String(Math.floor(options.expires.getTime() / 1000)));
     }
     let salt = options.salt || ab2hex(randomBytes(saltLength));
-    if (params.size) {
+    // params.size doesn't work with Node 16
+    if (Object.keys(Object.fromEntries(params)).length) {
         salt = salt + '?' + params.toString();
     }
     const number = options.number === void 0 ? randomInt(maxnumber) : options.number;
diff --git a/lib/index.ts b/lib/index.ts
index b4d696f..e279ee1 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -32,7 +32,8 @@ export async function createChallenge(
     params.set('expires', String(Math.floor(options.expires.getTime() / 1000)));
   }
   let salt = options.salt || ab2hex(randomBytes(saltLength));
-  if (params.size) {
+  // params.size doesn't work with Node 16
+  if (Object.keys(Object.fromEntries(params)).length) {
     salt = salt + '?' + params.toString();
   }
   const number =
diff --git a/package.json b/package.json
index ef46eea..731a793 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "altcha-lib",
-  "version": "0.2.1",
+  "version": "0.3.0",
   "description": "A library for creating and verifying ALTCHA challenges for Node.js, Bun and Deno.",
   "author": "Daniel Regeci",
   "license": "MIT",