@@ -72,7 +72,7 @@ func (graph *Graph) restore() error {

 // FIXME: Implement error subclass instead of looking at the error text

 // Note: This is the way golang implements os.IsNotExists on Plan9

 func (graph *Graph) IsNotExist(err error) bool {

-	return err != nil && (strings.Contains(err.Error(), "does not exist") || strings.Contains(err.Error(), "No such"))

+	return err != nil && (strings.Contains(strings.ToLower(err.Error()), "does not exist") || strings.Contains(strings.ToLower(err.Error()), "no such"))

 }

 // Exists returns true if an image is registered at the given id.