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-rw-r--r--include/mruby/boxing_word.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/mruby/boxing_word.h b/include/mruby/boxing_word.h
index 6ca491585..d1c457fae 100644
--- a/include/mruby/boxing_word.h
+++ b/include/mruby/boxing_word.h
@@ -66,7 +66,7 @@ MRB_API mrb_value mrb_word_boxing_float_pool(struct mrb_state*, mrb_float);
#define mrb_ptr(o) (o).value.p
#define mrb_cptr(o) (o).value.vp->p
#define mrb_float(o) (o).value.fp->f
-#define mrb_fixnum(o) (o).value.i
+#define mrb_fixnum(o) ((mrb_int)(o).value.i)
#define mrb_symbol(o) (o).value.sym
static inline enum mrb_vtype