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-rw-r--r--include/ruby/io.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/ruby/io.h b/include/ruby/io.h
index 189a5f211..6d71edaec 100644
--- a/include/ruby/io.h
+++ b/include/ruby/io.h
@@ -69,6 +69,7 @@ typedef struct rb_io_t {
rb_econv_t *writeconv;
VALUE writeconv_stateless;
+ rb_econv_option_t writeconv_pre_opts;
int writeconv_initialized;
} rb_io_t;