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-rw-r--r--mrbgems/mruby-string-ext/src/string.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mrbgems/mruby-string-ext/src/string.c b/mrbgems/mruby-string-ext/src/string.c
index 68d96cd6c..221de5009 100644
--- a/mrbgems/mruby-string-ext/src/string.c
+++ b/mrbgems/mruby-string-ext/src/string.c
@@ -253,7 +253,7 @@ mrb_str_succ_bang(mrb_state *mrb, mrb_value self)
{
mrb_value result;
unsigned char *p, *e, *b, *t;
- char *prepend;
+ const char *prepend;
struct RString *s = mrb_str_ptr(self);
size_t l;