diff --git a/CHANGELOG b/CHANGELOG
index 5d81ec2c..3b0300bc 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,6 +1,7 @@
 == Version 2.1.0 unreleased
 
 * Added python 3 compatibility
+* Fixed setting the format attribute on carrier and fulfillment services
 * Add a specific exception for signature validation failures
 
 == Version 2.0.4
diff --git a/shopify/resources/carrier_service.py b/shopify/resources/carrier_service.py
index 1dfdbb08..635e9d0a 100644
--- a/shopify/resources/carrier_service.py
+++ b/shopify/resources/carrier_service.py
@@ -2,4 +2,10 @@
 
 
 class CarrierService(ShopifyResource):
-    pass
+    def __get_format(self):
+        return self.attributes.get("format")
+
+    def __set_format(self, data):
+        self.attributes["format"] = data
+
+    format = property(__get_format, __set_format, None, "Format attribute")
diff --git a/shopify/resources/fulfillment_service.py b/shopify/resources/fulfillment_service.py
index f303fe38..c2c465b7 100644
--- a/shopify/resources/fulfillment_service.py
+++ b/shopify/resources/fulfillment_service.py
@@ -2,4 +2,10 @@
 
 
 class FulfillmentService(ShopifyResource):
-    pass
+    def __get_format(self):
+        return self.attributes.get("format")
+
+    def __set_format(self, data):
+        self.attributes["format"] = data
+
+    format = property(__get_format, __set_format, None, "Format attribute")
diff --git a/test/carrier_service_test.py b/test/carrier_service_test.py
index 955a6bdf..fbd96180 100644
--- a/test/carrier_service_test.py
+++ b/test/carrier_service_test.py
@@ -13,3 +13,8 @@ def test_get_carrier_service(self):
 
         carrier_service = shopify.CarrierService.find(123456)
         self.assertEqual("Some Postal Service", carrier_service.name)
+
+    def test_set_format_attribute(self):
+        carrier_service = shopify.CarrierService()
+        carrier_service.format = "json"
+        self.assertEqual("json", carrier_service.attributes['format'])
diff --git a/test/fulfillment_service_test.py b/test/fulfillment_service_test.py
index a1549f49..81296698 100644
--- a/test/fulfillment_service_test.py
+++ b/test/fulfillment_service_test.py
@@ -13,3 +13,8 @@ def test_get_fulfillment_service(self):
 
         fulfillment_service = shopify.FulfillmentService.find(123456)
         self.assertEqual("SomeService", fulfillment_service.name)
+
+    def test_set_format_attribute(self):
+        fulfillment_service = shopify.FulfillmentService()
+        fulfillment_service.format = "json"
+        self.assertEqual("json", fulfillment_service.attributes['format'])