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-rw-r--r--ext/zlib/zlib.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/zlib/zlib.c b/ext/zlib/zlib.c
index f119a17bf6..43448818d3 100644
--- a/ext/zlib/zlib.c
+++ b/ext/zlib/zlib.c
@@ -2471,7 +2471,7 @@ gzfile_reader_get_unused(struct gzfile *gz)
}
if (NIL_P(gz->z.input)) return Qnil;
- str = rb_str_dup(gz->z.input);
+ str = rb_str_new_shared(gz->z.input);
OBJ_TAINT(str); /* for safe */
return str;
}