diff --git a/src/Cookie/CookieJar.php b/src/Cookie/CookieJar.php
index aac527d9..6d090dbf 100644
--- a/src/Cookie/CookieJar.php
+++ b/src/Cookie/CookieJar.php
@@ -69,7 +69,7 @@ class CookieJar implements CookieJarInterface
     {
         if (substr($value, 0, 1) !== '"' &&
             substr($value, -1, 1) !== '"' &&
-            strpbrk($value, ';,')
+            strpbrk($value, ';,=')
         ) {
             $value = '"' . $value . '"';
         }
diff --git a/tests/Cookie/CookieJarTest.php b/tests/Cookie/CookieJarTest.php
index 94bc4b90..0598b6f2 100644
--- a/tests/Cookie/CookieJarTest.php
+++ b/tests/Cookie/CookieJarTest.php
@@ -32,6 +32,8 @@ class CookieJarTest extends \PHPUnit_Framework_TestCase
     {
         $this->assertEquals('foo', CookieJar::getCookieValue('foo'));
         $this->assertEquals('"foo,bar"', CookieJar::getCookieValue('foo,bar'));
+        $this->assertEquals('"foobar="', CookieJar::getCookieValue('foobar='));
+        $this->assertEquals('"foo;bar"', CookieJar::getCookieValue('foo;bar'));
     }
 
     public function testCreatesFromArray()