diff --git a/backend/swift/swift.go b/backend/swift/swift.go
index 09b962419..b0431aeba 100644
--- a/backend/swift/swift.go
+++ b/backend/swift/swift.go
@@ -1028,6 +1028,7 @@ func (o *Object) Storable() bool {
 
 // Open an object for read
 func (o *Object) Open(ctx context.Context, options ...fs.OpenOption) (in io.ReadCloser, err error) {
+	fs.FixRangeOption(options, o.size)
 	headers := fs.OpenOptionHeaders(options)
 	_, isRanging := headers["Range"]
 	err = o.fs.pacer.Call(func() (bool, error) {