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-rw-r--r--lib/rack/multipart/parser.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/rack/multipart/parser.rb b/lib/rack/multipart/parser.rb
index 22f9734b..0efe0939 100644
--- a/lib/rack/multipart/parser.rb
+++ b/lib/rack/multipart/parser.rb
@@ -117,7 +117,8 @@ module Rack
             end
 
             if filename
-              (@env['rack.tempfiles'] ||= []) << body = Tempfile.new("RackMultipart")
+              extname = ::File.extname(filename)
+              (@env['rack.tempfiles'] ||= []) << body = Tempfile.new(["RackMultipart", extname])
               body.binmode  if body.respond_to?(:binmode)
             end