diff --git a/ports/zephyr/machine_pin.c b/ports/zephyr/machine_pin.c
index 2240196690071..1baee656f5aca 100644
--- a/ports/zephyr/machine_pin.c
+++ b/ports/zephyr/machine_pin.c
@@ -270,7 +270,7 @@ static const mp_rom_map_elem_t machine_pin_locals_dict_table[] = {
 
     // class constants
     { MP_ROM_QSTR(MP_QSTR_IN),        MP_ROM_INT(GPIO_INPUT) },
-    { MP_ROM_QSTR(MP_QSTR_OUT),       MP_ROM_INT(GPIO_OUTPUT) },
+    { MP_ROM_QSTR(MP_QSTR_OUT),       MP_ROM_INT(GPIO_OUTPUT | GPIO_INPUT) },
     { MP_ROM_QSTR(MP_QSTR_PULL_UP),   MP_ROM_INT(GPIO_PULL_UP) },
     { MP_ROM_QSTR(MP_QSTR_PULL_DOWN), MP_ROM_INT(GPIO_PULL_DOWN) },
     { MP_ROM_QSTR(MP_QSTR_IRQ_RISING), MP_ROM_INT(GPIO_INT_EDGE_RISING) },