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-rw-r--r--include/ruby/io/buffer.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/ruby/io/buffer.h b/include/ruby/io/buffer.h
index 9c0eaefcc5..70dc9a5df8 100644
--- a/include/ruby/io/buffer.h
+++ b/include/ruby/io/buffer.h
@@ -23,6 +23,7 @@ RBIMPL_SYMBOL_EXPORT_BEGIN()
RUBY_EXTERN VALUE rb_cIOBuffer;
RUBY_EXTERN size_t RUBY_IO_BUFFER_PAGE_SIZE;
+RUBY_EXTERN size_t RUBY_IO_BUFFER_DEFAULT_SIZE;
enum rb_io_buffer_flags {
// The memory in the buffer is owned by someone else.