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-rw-r--r--include/mruby/data.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/mruby/data.h b/include/mruby/data.h
index 55405e994..6ddaebfaa 100644
--- a/include/mruby/data.h
+++ b/include/mruby/data.h
@@ -19,7 +19,7 @@ typedef struct mrb_data_type {
struct RData {
MRB_OBJECT_HEADER;
struct iv_tbl *iv;
- mrb_data_type *type;
+ const mrb_data_type *type;
void *data;
};