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-rw-r--r--ext/json/parser/parser.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/json/parser/parser.c b/ext/json/parser/parser.c
index f777d7630b..f9ab9abfa0 100644
--- a/ext/json/parser/parser.c
+++ b/ext/json/parser/parser.c
@@ -1344,7 +1344,7 @@ static VALUE cParser_parse(JSON_ParserConfig *config, VALUE Vsource)
JSON_ParserState _state = {
.config = config,
.cursor = RSTRING_PTR(Vsource),
- .end = RSTRING_PTR(Vsource) + RSTRING_LEN(Vsource),
+ .end = RSTRING_END(Vsource),
.stack = &stack,
};
JSON_ParserState *state = &_state;