diff --git a/src/Requests/MailchimpRequest.php b/src/Requests/MailchimpRequest.php
index 47c60c93..4eff51c2 100644
--- a/src/Requests/MailchimpRequest.php
+++ b/src/Requests/MailchimpRequest.php
@@ -210,6 +210,7 @@ public function getHeaders()
         if (!is_array($this->headers)) {
             throw new MailchimpException("Request headers must be of type array");
         }
+        $this->headers[] = 'Expect:';
         return $this->headers;
     }
 
diff --git a/tests/UtilityTests/MailchimpRequestTest.php b/tests/UtilityTests/MailchimpRequestTest.php
index d0f58093..2bb1d8ec 100644
--- a/tests/UtilityTests/MailchimpRequestTest.php
+++ b/tests/UtilityTests/MailchimpRequestTest.php
@@ -24,6 +24,13 @@ public function testAuthHeadersSet()
         self::assertEquals($expected, $actual, "Auth Header should be appropriately set");
     }
 
+    public function testExpectHeaderNotSet()
+    {
+        $expected = 'Expect:';
+        $actual = $this->requestInstance->getHeaders()[1];
+        self::assertEquals($expected, $actual, "Expect header should be empty");
+    }
+
     public function testApikeySet()
     {
         self::assertEquals(