diff --git a/libraries/AP_Airspeed/AP_Airspeed_ND210.cpp b/libraries/AP_Airspeed/AP_Airspeed_ND210.cpp
index 0ef6740da737b..27e816a011159 100644
--- a/libraries/AP_Airspeed/AP_Airspeed_ND210.cpp
+++ b/libraries/AP_Airspeed/AP_Airspeed_ND210.cpp
@@ -240,7 +240,7 @@ void AP_Airspeed_ND210::_timer()
         return;
     }
 
-    uint16_t P = (((uint16_t)val[0]) << 8) | val[1];
+    int16_t P = (((int16_t)val[0]) << 8) | val[1];
     float diff_pressure_h20 = (float(P) / ND210_SCALE_PRESSURE_ND210) * _selected_pressure_range;
     // GCS_SEND_TEXT(MAV_SEVERITY_ERROR, "ND210 Raw Pressure = 0x%02X", P);
 
diff --git a/libraries/AP_Airspeed/AP_Airspeed_ND210.h b/libraries/AP_Airspeed/AP_Airspeed_ND210.h
index ee527f12d4d68..d236729d3c600 100644
--- a/libraries/AP_Airspeed/AP_Airspeed_ND210.h
+++ b/libraries/AP_Airspeed/AP_Airspeed_ND210.h
@@ -14,11 +14,7 @@
  */
 #pragma once
 
-#include <AP_HAL/AP_HAL_Boards.h>
-
-#ifndef AP_AIRSPEED_ND210_ENABLED
-#define AP_AIRSPEED_ND210_ENABLED AP_AIRSPEED_BACKEND_DEFAULT_ENABLED
-#endif
+#include "AP_Airspeed_config.h"
 
 #if AP_AIRSPEED_ND210_ENABLED
 
diff --git a/libraries/AP_Airspeed/AP_Airspeed_config.h b/libraries/AP_Airspeed/AP_Airspeed_config.h
index f12db5cb16c4e..6a648652204ac 100644
--- a/libraries/AP_Airspeed/AP_Airspeed_config.h
+++ b/libraries/AP_Airspeed/AP_Airspeed_config.h
@@ -71,3 +71,7 @@
 #ifndef AP_AIRSPEED_EXTERNAL_ENABLED
 #define AP_AIRSPEED_EXTERNAL_ENABLED AP_AIRSPEED_ENABLED && HAL_EXTERNAL_AHRS_ENABLED
 #endif
+
+#ifndef AP_AIRSPEED_ND210_ENABLED
+#define AP_AIRSPEED_ND210_ENABLED AP_AIRSPEED_ENABLED
+#endif
\ No newline at end of file