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-rw-r--r--ext/json/ext/parser/parser.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/json/ext/parser/parser.h b/ext/json/ext/parser/parser.h
index 2be640e..f2ce5a4 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) rb_enc_associate((obj), rb_utf8_encoding())
+#define FORCE_UTF8(obj) ((obj) = rb_enc_associate(rb_str_dup(obj), rb_utf8_encoding()))
 #else
 #define FORCE_UTF8(obj)
 #endif