diff --git a/cjs/dist/index.js b/cjs/dist/index.js
index 5040a5f..99af199 100644
--- a/cjs/dist/index.js
+++ b/cjs/dist/index.js
@@ -70,11 +70,8 @@ async function verifySolution(payload, hmacKey, checkExpires = true) {
         }
     }
     const params = extractParams(payload);
-    if (checkExpires) {
-        const expires = params.expires || params.expire;
-        if (!expires) {
-            return false;
-        }
+    const expires = params.expires || params.expire;
+    if (checkExpires && expires) {
         const date = new Date(parseInt(expires, 10) * 1000);
         if (Number.isNaN(date.getTime()) || date.getTime() < Date.now()) {
             return false;
diff --git a/deno_dist/index.ts b/deno_dist/index.ts
index da5c47a..1693c74 100644
--- a/deno_dist/index.ts
+++ b/deno_dist/index.ts
@@ -90,11 +90,8 @@ export async function verifySolution(
     }
   }
   const params = extractParams(payload);
-  if (checkExpires) {
-    const expires = params.expires || params.expire;
-    if (!expires) {
-      return false;
-    }
+  const expires = params.expires || params.expire;
+  if (checkExpires && expires) {
     const date = new Date(parseInt(expires, 10) * 1000);
     if (Number.isNaN(date.getTime()) || date.getTime() < Date.now()) {
       return false;
diff --git a/dist/index.js b/dist/index.js
index 448af8f..b37e5c8 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -61,11 +61,8 @@ export async function verifySolution(payload, hmacKey, checkExpires = true) {
         }
     }
     const params = extractParams(payload);
-    if (checkExpires) {
-        const expires = params.expires || params.expire;
-        if (!expires) {
-            return false;
-        }
+    const expires = params.expires || params.expire;
+    if (checkExpires && expires) {
         const date = new Date(parseInt(expires, 10) * 1000);
         if (Number.isNaN(date.getTime()) || date.getTime() < Date.now()) {
             return false;
diff --git a/lib/index.ts b/lib/index.ts
index 1498a3b..b31682a 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -90,11 +90,8 @@ export async function verifySolution(
     }
   }
   const params = extractParams(payload);
-  if (checkExpires) {
-    const expires = params.expires || params.expire;
-    if (!expires) {
-      return false;
-    }
+  const expires = params.expires || params.expire;
+  if (checkExpires && expires) {
     const date = new Date(parseInt(expires, 10) * 1000);
     if (Number.isNaN(date.getTime()) || date.getTime() < Date.now()) {
       return false;
diff --git a/package.json b/package.json
index f43147f..f535b95 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "altcha-lib",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "A library for creating and verifying ALTCHA challenges for Node.js, Bun and Deno.",
   "author": {
     "name": "Daniel Regeci",
diff --git a/tests/challenge.test.ts b/tests/challenge.test.ts
index c337464..54c3a67 100644
--- a/tests/challenge.test.ts
+++ b/tests/challenge.test.ts
@@ -150,7 +150,6 @@ describe('challenge', () => {
           signature: challenge.signature,
         },
         hmacKey,
-        false // don't check expires
       );
       expect(ok).toEqual(true);
     });
@@ -289,27 +288,6 @@ describe('challenge', () => {
       expect(ok).toEqual(false);
     });
 
-    it('should return false if the challenge does not include expires param but should be checked', async () => {
-      const number = 100;
-      const challenge = await createChallenge({
-        expires: undefined,
-        number,
-        hmacKey,
-      });
-      const ok = await verifySolution(
-        {
-          algorithm: challenge.algorithm,
-          challenge: challenge.challenge,
-          number,
-          salt: challenge.salt,
-          signature: challenge.signature,
-        },
-        hmacKey,
-        true // make sure expires is checked
-      );
-      expect(ok).toEqual(false);
-    });
-
     it('should return false if the expires is malformated', async () => {
       const number = 100;
       const challenge = await createChallenge({