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-rw-r--r--lib/axlsx/package.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/axlsx/package.rb b/lib/axlsx/package.rb
index d9865a48..1b30c815 100644
--- a/lib/axlsx/package.rb
+++ b/lib/axlsx/package.rb
@@ -124,7 +124,7 @@ module Axlsx
def to_stream(confirm_valid=false)
return false unless !confirm_valid || self.validate.empty?
Relationship.initialize_ids_cache
- zip = write_parts(Zip::OutputStream.new(StringIO.new, true))
+ zip = write_parts(Zip::OutputStream.new(StringIO.new.binmode, true))
stream = zip.close_buffer
stream.rewind
stream