1 files changed, 4 insertions, 1 deletions
diff --git a/actionpack/lib/action_dispatch/http/upload.rb b/actionpack/lib/action_dispatch/http/upload.rb
index 827f022ca2..0da8f5c14e 100644
--- a/actionpack/lib/action_dispatch/http/upload.rb
+++ b/actionpack/lib/action_dispatch/http/upload.rb
@@ -20,7 +20,6 @@ module ActionDispatch
       # A +Tempfile+ object with the actual uploaded file. Note that some of
       # its interface is available directly.
       attr_accessor :tempfile
-      alias :to_io :tempfile
 
       # A string with the headers of the multipart request.
       attr_accessor :headers
@@ -84,6 +83,10 @@ module ActionDispatch
       def eof?
         @tempfile.eof?
       end
+
+      def to_io
+        @tempfile.to_io
+      end
     end
   end
 end