1 files changed, 1 insertions, 1 deletions
diff --git a/lib/csv.rb b/lib/csv.rb
index fe153153be..b6d9121146 100644
--- a/lib/csv.rb
+++ b/lib/csv.rb
@@ -1655,7 +1655,7 @@ class CSV
     if @io.is_a?(StringIO)             and
        output.encoding != raw_encoding and
        (compatible_encoding = Encoding.compatible?(@io.string, output))
-      @io = StringIO.new(@io.string.force_encoding(compatible_encoding))
+      @io.set_encoding(compatible_encoding)
       @io.seek(0, IO::SEEK_END)
     end
     @io << output