diff --git a/libraries/AP_HAL_PX4/RCInput.cpp b/libraries/AP_HAL_PX4/RCInput.cpp
index ba2741421c..5c29821319 100644
--- a/libraries/AP_HAL_PX4/RCInput.cpp
+++ b/libraries/AP_HAL_PX4/RCInput.cpp
@@ -24,7 +24,7 @@ void PX4RCInput::init()
     clear_overrides();
     pthread_mutex_init(&rcin_mutex, nullptr);
 
-#ifdef HAL_RCINPUT_WITH_AP_RADIO
+#if HAL_RCINPUT_WITH_AP_RADIO
     radio = AP_Radio::instance();
     if (radio) {
         radio->init();
@@ -80,7 +80,7 @@ uint16_t PX4RCInput::read(uint8_t ch)
     uint16_t v = _rcin.values[ch];
     pthread_mutex_unlock(&rcin_mutex);
 
-#ifdef HAL_RCINPUT_WITH_AP_RADIO
+#if HAL_RCINPUT_WITH_AP_RADIO
     if (radio && ch == 0) {
         // hook to allow for update of radio on main thread, for mavlink sends
         radio->update();
@@ -161,7 +161,7 @@ void PX4RCInput::_timer_tick(void)
         pthread_mutex_unlock(&rcin_mutex);
     }
 
-#ifdef HAL_RCINPUT_WITH_AP_RADIO
+#if HAL_RCINPUT_WITH_AP_RADIO
     if (radio && radio->last_recv_us() != last_radio_us) {
         last_radio_us = radio->last_recv_us();
         pthread_mutex_lock(&rcin_mutex);
@@ -190,7 +190,7 @@ bool PX4RCInput::rc_bind(int dsmMode)
         return false;
     }
 
-#ifdef HAL_RCINPUT_WITH_AP_RADIO
+#if HAL_RCINPUT_WITH_AP_RADIO
     if (radio) {
         radio->start_recv_bind();
     }
diff --git a/libraries/AP_HAL_PX4/RCInput.h b/libraries/AP_HAL_PX4/RCInput.h
index e77d178b6f..9bf3fe002f 100644
--- a/libraries/AP_HAL_PX4/RCInput.h
+++ b/libraries/AP_HAL_PX4/RCInput.h
@@ -45,7 +45,7 @@ private:
     uint8_t last_input_source = input_rc_s::RC_INPUT_SOURCE_UNKNOWN;
     const char *input_source_name(uint8_t id) const;
 
-#ifdef HAL_RCINPUT_WITH_AP_RADIO
+#if HAL_RCINPUT_WITH_AP_RADIO
     AP_Radio *radio;
     uint32_t last_radio_us;
 #endif