diff --git a/lib/zip/streamable_stream.rb b/lib/zip/streamable_stream.rb
index fc1c9a2d..2a4bf507 100644
--- a/lib/zip/streamable_stream.rb
+++ b/lib/zip/streamable_stream.rb
@@ -5,7 +5,7 @@ def initialize(entry)
       dirname = if zipfile.is_a?(::String)
                   ::File.dirname(zipfile)
                 else
-                  '.'
+                  nil
                 end
       @temp_file = Tempfile.new(::File.basename(name), dirname)
       @temp_file.binmode