diff --git a/APMrover2/system.cpp b/APMrover2/system.cpp
index d20a12585b..de26f64a7d 100644
--- a/APMrover2/system.cpp
+++ b/APMrover2/system.cpp
@@ -294,17 +294,13 @@ void Rover::notify_mode(const Mode *mode)
  */
 uint8_t Rover::check_digital_pin(uint8_t pin)
 {
-    const int8_t dpin = hal.gpio->analogPinToDigitalPin(pin);
-    if (dpin == -1) {
-        return 0;
-    }
     // ensure we are in input mode
-    hal.gpio->pinMode(dpin, HAL_GPIO_INPUT);
+    hal.gpio->pinMode(pin, HAL_GPIO_INPUT);
 
     // enable pullup
-    hal.gpio->write(dpin, 1);
+    hal.gpio->write(pin, 1);
 
-    return hal.gpio->read(dpin);
+    return hal.gpio->read(pin);
 }
 
 /*