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-rw-r--r--include/mruby/boxing_nan.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/mruby/boxing_nan.h b/include/mruby/boxing_nan.h
index a28a3e56d..77b6204a3 100644
--- a/include/mruby/boxing_nan.h
+++ b/include/mruby/boxing_nan.h
@@ -68,7 +68,7 @@ mrb_nan_boxing_value_float(mrb_value v)
r.u = float_uint_union.u + 0x8004000000000000; \
} while(0)
-#define mrb_float_p(o) (((uint64_t)(o.u)&0xfffc000000000000) != 0)
+#define mrb_float_p(o) (((uint64_t)((o).u)&0xfffc000000000000) != 0)
struct RInteger {
MRB_OBJECT_HEADER;