diff --git a/internal/numeric.h b/internal/numeric.h
index 440bef1671..19069cb3bc 100644
--- a/internal/numeric.h
+++ b/internal/numeric.h
@@ -35,7 +35,7 @@ enum ruby_num_rounding_mode {
     RUBY_NUM_ROUND_DEFAULT = ROUND_DEFAULT,
 };
 
-#if SIZEOF_DOUBLE < SIZEOF_VALUE
+#if SIZEOF_DOUBLE <= SIZEOF_VALUE
 typedef double rb_float_value_type;
 #else
 typedef struct {
@@ -218,7 +218,7 @@ rb_float_flonum_value(VALUE v)
 static inline double
 rb_float_noflonum_value(VALUE v)
 {
-#if SIZEOF_DOUBLE < SIZEOF_VALUE
+#if SIZEOF_DOUBLE <= SIZEOF_VALUE
     return RFLOAT(v)->float_value;
 #else
     union {
diff --git a/numeric.c b/numeric.c
index 3ee98343a7..715f11c631 100644
--- a/numeric.c
+++ b/numeric.c
@@ -951,7 +951,7 @@ rb_float_new_in_heap(double d)
 {
     NEWOBJ_OF(flt, struct RFloat, rb_cFloat, T_FLOAT | (RGENGC_WB_PROTECTED_FLOAT ? FL_WB_PROTECTED : 0));
 
-#if SIZEOF_DOUBLE < SIZEOF_VALUE
+#if SIZEOF_DOUBLE <= SIZEOF_VALUE
     flt->float_value = d;
 #else
     union {