diff --git a/openstack/identity/v2/extensions/admin/roles/results.go b/openstack/identity/v2/extensions/admin/roles/results.go
index 608f206..28de6bb 100644
--- a/openstack/identity/v2/extensions/admin/roles/results.go
+++ b/openstack/identity/v2/extensions/admin/roles/results.go
@@ -26,18 +26,17 @@
 }
 
 // IsEmpty determines whether or not a page of Tenants contains any results.
-func (page RolePage) IsEmpty() (bool, error) {
-	users, err := ExtractRoles(page)
+func (r RolePage) IsEmpty() (bool, error) {
+	users, err := ExtractRoles(r)
 	return len(users) == 0, err
 }
 
 // ExtractRoles returns a slice of roles contained in a single page of results.
-func ExtractRoles(page pagination.Page) ([]Role, error) {
-	r := page.(RolePage)
+func ExtractRoles(r pagination.Page) ([]Role, error) {
 	var s struct {
 		Roles []Role `json:"roles"`
 	}
-	err := r.ExtractInto(&s)
+	err := (r.(RolePage)).ExtractInto(&s)
 	return s.Roles, err
 }