diff --git a/py/objbool.c b/py/objbool.c
index 8882a835d3..2a086020de 100644
--- a/py/objbool.c
+++ b/py/objbool.c
@@ -66,16 +66,11 @@ STATIC mp_obj_t bool_make_new(const mp_obj_type_t *type_in, size_t n_args, size_
 }
 
 STATIC mp_obj_t bool_unary_op(mp_uint_t op, mp_obj_t o_in) {
-    mp_int_t value = ((mp_obj_bool_t*)MP_OBJ_TO_PTR(o_in))->value;
-    switch (op) {
-        case MP_UNARY_OP_BOOL: return o_in;
-        // needs to hash to the same value as if converting to an integer
-        case MP_UNARY_OP_HASH: return MP_OBJ_NEW_SMALL_INT(value);
-        case MP_UNARY_OP_POSITIVE: return MP_OBJ_NEW_SMALL_INT(value);
-        case MP_UNARY_OP_NEGATIVE: return MP_OBJ_NEW_SMALL_INT(-value);
-        case MP_UNARY_OP_INVERT: return MP_OBJ_NEW_SMALL_INT(~value);
-        default: return MP_OBJ_NULL; // op not supported
+    if (op == MP_UNARY_OP_LEN) {
+        return MP_OBJ_NULL;
     }
+    mp_obj_bool_t *self = MP_OBJ_TO_PTR(o_in);
+    return mp_unary_op(op, MP_OBJ_NEW_SMALL_INT(self->value));
 }
 
 STATIC mp_obj_t bool_binary_op(mp_uint_t op, mp_obj_t lhs_in, mp_obj_t rhs_in) {