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-rw-r--r--encoding.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/encoding.c b/encoding.c
index fc7fa37e24..422744478e 100644
--- a/encoding.c
+++ b/encoding.c
@@ -207,6 +207,7 @@ set_base_encoding(int index, rb_encoding *base)
VALUE enc = rb_enc_from_encoding(enc_table[index].enc);
rb_ivar_set(enc, id_base_encoding, rb_enc_from_encoding(base));
+ if (ENC_DUMMY_P(base)) FL_SET(enc, ENC_DUMMY);
return enc;
}