diff --git a/backend/protondrive/protondrive.go b/backend/protondrive/protondrive.go
index 415db44a8..342cb34b5 100644
--- a/backend/protondrive/protondrive.go
+++ b/backend/protondrive/protondrive.go
@@ -883,7 +883,9 @@ func (o *Object) Storable() bool {
 
 // Open opens the file for read.  Call Close() on the returned io.ReadCloser
 func (o *Object) Open(ctx context.Context, options ...fs.OpenOption) (io.ReadCloser, error) {
-	fs.FixRangeOption(options, *o.originalSize)
+	if o.originalSize != nil {
+		fs.FixRangeOption(options, *o.originalSize)
+	}
 	var offset, limit int64 = 0, -1
 	for _, option := range options { // if the caller passes in nil for options, it will become array of nil
 		switch x := option.(type) {