diff --git a/src/riscv_ulp_hal/sys/gpio.rs b/src/riscv_ulp_hal/sys/gpio.rs
index 2d3049532..64e516f80 100644
--- a/src/riscv_ulp_hal/sys/gpio.rs
+++ b/src/riscv_ulp_hal/sys/gpio.rs
@@ -16,6 +16,8 @@ pub type touch_pad_t = i32;
 #[allow(non_camel_case_types)]
 pub type adc_atten_t = i32;
 #[allow(non_camel_case_types)]
+pub type gpio_mode_t = u8;
+#[allow(non_camel_case_types)]
 pub type gpio_pull_mode_t = u8;
 
 #[allow(non_upper_case_globals)]