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-rw-r--r--include/mruby/proc.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/mruby/proc.h b/include/mruby/proc.h
index ef5357d5d..12013c3ae 100644
--- a/include/mruby/proc.h
+++ b/include/mruby/proc.h
@@ -34,7 +34,7 @@ struct REnv {
#define MRB_ENV_HEAP_P(e) ((e)->flags & MRB_ENV_HEAPED)
#define MRB_ENV_ONSTACK_P(e) (((e)->flags & MRB_ENV_CLOSED) == 0)
#define MRB_ENV_BIDX(e) (((e)->flags >> 8) & 0xff)
-#define MRB_ENV_SET_BIDX(e,idx) ((e)->flags = (((e)->flags & ~(0xff<<8))|((unsigned int)(idx) & 0xff)<<10))
+#define MRB_ENV_SET_BIDX(e,idx) ((e)->flags = (((e)->flags & ~(0xff<<8))|((unsigned int)(idx) & 0xff)<<8))
void mrb_env_unshare(mrb_state*, struct REnv*);