Base a pagination.PageResult on gophercloud.Result.
diff --git a/openstack/common/extensions/requests.go b/openstack/common/extensions/requests.go
index 79ea63d..f1b9c22 100755
--- a/openstack/common/extensions/requests.go
+++ b/openstack/common/extensions/requests.go
@@ -20,7 +20,7 @@
 // List returns a Pager which allows you to iterate over the full collection of extensions.
 // It does not accept query parameters.
 func List(c *gophercloud.ServiceClient) pagination.Pager {
-	return pagination.NewPager(c, ListExtensionURL(c), func(r pagination.LastHTTPResponse) pagination.Page {
+	return pagination.NewPager(c, ListExtensionURL(c), func(r pagination.PageResult) pagination.Page {
 		return ExtensionPage{pagination.SinglePageBase(r)}
 	})
 }