diff --git a/src/Cookie/SetCookie.php b/src/Cookie/SetCookie.php
index ac9a89081..6fdee0dd3 100644
--- a/src/Cookie/SetCookie.php
+++ b/src/Cookie/SetCookie.php
@@ -333,7 +333,7 @@ public function matchesDomain($domain)
      */
     public function isExpired()
     {
-        return $this->getExpires() && time() > $this->getExpires();
+        return $this->getExpires() !== null && time() > $this->getExpires();
     }
 
     /**
diff --git a/tests/Cookie/SetCookieTest.php b/tests/Cookie/SetCookieTest.php
index 3ddd08201..e1229212d 100644
--- a/tests/Cookie/SetCookieTest.php
+++ b/tests/Cookie/SetCookieTest.php
@@ -361,4 +361,45 @@ public function testParseCookie($cookie, $parsed)
             }
         }
     }
+
+    /**
+     * Provides the data for testing isExpired
+     *
+     * @return array
+     */
+    public function isExpiredProvider() {
+        return array(
+            array(
+                'FOO=bar; expires=Thu, 01 Jan 1970 00:00:00 GMT;',
+                true,
+            ),
+            array(
+                'FOO=bar; expires=Thu, 01 Jan 1970 00:00:01 GMT;',
+                true,
+            ),
+            array(
+                'FOO=bar; expires='.date(\DateTime::RFC1123, time()+10).';',
+                false,
+            ),
+            array(
+                'FOO=bar; expires='.date(\DateTime::RFC1123, time()-10).';',
+                true,
+            ),
+            array(
+                'FOO=bar;',
+                false,
+            ),
+        );
+    }
+
+    /**
+     * @dataProvider isExpiredProvider
+     */
+    public function testIsExpired($cookie, $expired)
+    {
+        $this->assertEquals(
+            $expired,
+            SetCookie::fromString($cookie)->isExpired()
+        );
+    }
 }