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-rw-r--r--ext/json/ext/parser/parser.h2
-rw-r--r--ext/json/ext/parser/parser.rl1
2 files changed, 2 insertions, 1 deletions
diff --git a/ext/json/ext/parser/parser.h b/ext/json/ext/parser/parser.h
index f2ce5a4..2be640e 100644
--- a/ext/json/ext/parser/parser.h
+++ b/ext/json/ext/parser/parser.h
@@ -9,7 +9,7 @@
#ifdef HAVE_RUBY_ENCODING_H
#include "ruby/encoding.h"
-#define FORCE_UTF8(obj) ((obj) = rb_enc_associate(rb_str_dup(obj), rb_utf8_encoding()))
+#define FORCE_UTF8(obj) rb_enc_associate((obj), rb_utf8_encoding())
#else
#define FORCE_UTF8(obj)
#endif
diff --git a/ext/json/ext/parser/parser.rl b/ext/json/ext/parser/parser.rl
index 3257a48..21b445e 100644
--- a/ext/json/ext/parser/parser.rl
+++ b/ext/json/ext/parser/parser.rl
@@ -581,6 +581,7 @@ static VALUE convert_encoding(VALUE source)
} else if (len >= 4 && ptr[1] == 0 && ptr[3] == 0) {
source = rb_funcall(source, i_encode, 2, CEncoding_UTF_8, CEncoding_UTF_16LE);
} else {
+ source = rb_str_dup(source);
FORCE_UTF8(source);
}
} else {