diff --git a/openstack/identity/v3/services/results.go b/openstack/identity/v3/services/results.go
index 45040c6..b0d36fb 100644
--- a/openstack/identity/v3/services/results.go
+++ b/openstack/identity/v3/services/results.go
@@ -59,11 +59,10 @@
 }
 
 // ExtractServices extracts a slice of Services from a Collection acquired from List.
-func ExtractServices(page pagination.Page) ([]Service, error) {
-	r := page.(ServicePage)
+func ExtractServices(r pagination.Page) ([]Service, error) {
 	var s struct {
 		Services []Service `json:"services"`
 	}
-	err := r.ExtractInto(&s)
+	err := (r.(ServicePage)).ExtractInto(&s)
 	return s.Services, err
 }