diff --git a/openstack/utils/choose_version.go b/openstack/utils/choose_version.go
index 52f37a9..b697ba8 100644
--- a/openstack/utils/choose_version.go
+++ b/openstack/utils/choose_version.go
@@ -23,7 +23,7 @@
 // ChooseVersion queries the base endpoint of an API to choose the most recent non-experimental alternative from a service's
 // published versions.
 // It returns the highest-Priority Version among the alternatives that are provided, as well as its corresponding endpoint.
-func ChooseVersion(identityBase string, identityEndpoint string, recognized []*Version) (*Version, string, error) {
+func ChooseVersion(client *gophercloud.ProviderClient, recognized []*Version) (*Version, string, error) {
 	type linkResp struct {
 		Href string `json:"href"`
 		Rel  string `json:"rel"`
@@ -49,7 +49,7 @@
 		}
 		return endpoint
 	}
-	identityEndpoint = normalize(identityEndpoint)
+	identityEndpoint := normalize(client.IdentityEndpoint)
 
 	// If a full endpoint is specified, check version suffixes for a match first.
 	for _, v := range recognized {
@@ -59,7 +59,7 @@
 	}
 
 	var resp response
-	_, err := client.Request("GET", identityBase, gophercloud.RequestOpts{
+	_, err := client.Request("GET", client.IdentityBase, gophercloud.RequestOpts{
 		JSONResponse: &resp,
 		OkCodes:      []int{200, 300},
 	})
@@ -88,7 +88,7 @@
 			// Prefer a version that exactly matches the provided endpoint.
 			if href == identityEndpoint {
 				if href == "" {
-					return nil, "", fmt.Errorf("Endpoint missing in version %s response from %s", value.ID, identityBase)
+					return nil, "", fmt.Errorf("Endpoint missing in version %s response from %s", value.ID, client.IdentityBase)
 				}
 				return matching, href, nil
 			}
@@ -104,10 +104,10 @@
 	}
 
 	if highest == nil {
-		return nil, "", fmt.Errorf("No supported version available from endpoint %s", identityBase)
+		return nil, "", fmt.Errorf("No supported version available from endpoint %s", client.IdentityBase)
 	}
 	if endpoint == "" {
-		return nil, "", fmt.Errorf("Endpoint missing in version %s response from %s", highest.ID, identityBase)
+		return nil, "", fmt.Errorf("Endpoint missing in version %s response from %s", highest.ID, client.IdentityBase)
 	}
 
 	return highest, endpoint, nil