diff --git a/shopify/resources/fulfillment.py b/shopify/resources/fulfillment.py
index fcf74863..527fd56c 100644
--- a/shopify/resources/fulfillment.py
+++ b/shopify/resources/fulfillment.py
@@ -5,6 +5,14 @@
 class Fulfillment(ShopifyResource):
     _prefix_source = "/orders/$order_id/"
 
+    @classmethod
+    def _prefix(cls, options={}):
+        order_id = options.get("order_id")
+        if order_id:
+            return "%s/orders/%s" % (cls.site, order_id)
+        else:
+            return cls.site
+    
     def cancel(self):
         self._load_attributes_from_response(self.post("cancel"))