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-rw-r--r--include/ruby/intern.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/ruby/intern.h b/include/ruby/intern.h
index a75f813d12..70fbb00ca0 100644
--- a/include/ruby/intern.h
+++ b/include/ruby/intern.h
@@ -374,6 +374,7 @@ VALUE rb_io_write(VALUE, VALUE);
VALUE rb_io_gets(VALUE);
VALUE rb_io_getbyte(VALUE);
VALUE rb_io_ungetc(VALUE, VALUE);
+VALUE rb_io_ungetbyte(VALUE, VALUE);
VALUE rb_io_close(VALUE);
VALUE rb_io_flush(VALUE);
VALUE rb_io_eof(VALUE);