diff --git a/activity.go b/activity.go
index 3a10a5f..abd1940 100644
--- a/activity.go
+++ b/activity.go
@@ -62,9 +62,9 @@ type activityArgs struct {
 	Activity *Activity `json:"activity"`
 }
 
-func (d *Client) SetActivity(act *Activity) error {
+func (d *Client) SetActivity(act *Activity) (string, error) {
 	if err := d.activate(); err != nil {
-		return err
+		return "", err
 	}
 
 	nonce := uuid.New().String()
@@ -80,5 +80,5 @@ func (d *Client) SetActivity(act *Activity) error {
 				Nonce:   nonce,
 			},
 		})
-	return err
+	return nonce, err
 }