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-rw-r--r--lib/rack/multipart/generator.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/rack/multipart/generator.rb b/lib/rack/multipart/generator.rb
index 6367135f..f0b70a8d 100644
--- a/lib/rack/multipart/generator.rb
+++ b/lib/rack/multipart/generator.rb
@@ -22,7 +22,7 @@ module Rack
           else
             content_for_other(file, name)
           end
-        end.join + "--#{MULTIPART_BOUNDARY}--\r"
+        end.join << "--#{MULTIPART_BOUNDARY}--\r"
       end
 
       private