diff --git a/src/drivers/drv_gpio.h b/src/drivers/drv_gpio.h
index d330eb8c5c..03107a147e 100644
--- a/src/drivers/drv_gpio.h
+++ b/src/drivers/drv_gpio.h
@@ -79,9 +79,6 @@
 
 #define GPIO_PERIPHERAL_RAIL_RESET	GPIOC(14)
 
-/** configure the board GPIOs in (arg) as outputs, initially low */
-#define GPIO_SET_OUTPUT_LOW	GPIOC(15)
-
 /** configure the board GPIOs in (arg) as outputs, initially high */
 #define GPIO_SET_OUTPUT_HIGH	GPIOC(16)
 
diff --git a/src/drivers/px4fmu/fmu.cpp b/src/drivers/px4fmu/fmu.cpp
index 446fe07bbe..779cbdc27d 100644
--- a/src/drivers/px4fmu/fmu.cpp
+++ b/src/drivers/px4fmu/fmu.cpp
@@ -2685,13 +2685,6 @@ PX4FMU::gpio_set_function(uint32_t gpios, int function)
 
 				break;
 
-			case GPIO_SET_OUTPUT_LOW:
-				if (_gpio_tab[i].output) {
-					px4_arch_configgpio((_gpio_tab[i].output & ~(GPIO_OUTPUT_SET)) | GPIO_OUTPUT_CLEAR);
-				}
-
-				break;
-
 			case GPIO_SET_OUTPUT_HIGH:
 				if (_gpio_tab[i].output) {
 					px4_arch_configgpio((_gpio_tab[i].output & ~(GPIO_OUTPUT_CLEAR)) | GPIO_OUTPUT_SET);
@@ -2900,7 +2893,6 @@ PX4FMU::gpio_ioctl(struct file *filp, int cmd, unsigned long arg)
 		break;
 
 	case GPIO_SET_OUTPUT:
-	case GPIO_SET_OUTPUT_LOW:
 	case GPIO_SET_OUTPUT_HIGH:
 	case GPIO_SET_INPUT:
 		ret = gpio_set_function(arg, cmd);