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-rw-r--r--mrbgems/mruby-string-ext/src/string.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mrbgems/mruby-string-ext/src/string.c b/mrbgems/mruby-string-ext/src/string.c
index f194bbc0e..274acf6f4 100644
--- a/mrbgems/mruby-string-ext/src/string.c
+++ b/mrbgems/mruby-string-ext/src/string.c
@@ -33,8 +33,8 @@ mrb_str_swapcase_bang(mrb_state *mrb, mrb_value str)
struct RString *s = mrb_str_ptr(str);
mrb_str_modify(mrb, s);
- p = s->ptr;
- pend = s->ptr + s->len;
+ p = s->as.heap.ptr;
+ pend = s->as.heap.ptr + s->as.heap.len;
while (p < pend) {
if (ISUPPER(*p)) {
*p = TOLOWER(*p);