diff --git a/libraries/AP_HAL/board/px4.h b/libraries/AP_HAL/board/px4.h
index 3bb4494625..33a78012c4 100644
--- a/libraries/AP_HAL/board/px4.h
+++ b/libraries/AP_HAL/board/px4.h
@@ -85,6 +85,7 @@
 #define HAL_COMPASS_IST8310_I2C_BUS 1
 #define HAL_SERIAL0_BAUD_DEFAULT 460800
 #define HAL_HAVE_BOARD_VOLTAGE 0
+#define HAL_PX4_HAVE_MTD_SUPPORT 0
 #endif
 
 /* default values */
@@ -95,3 +96,7 @@
 #ifndef HAL_HAVE_BOARD_VOLTAGE
 #define HAL_HAVE_BOARD_VOLTAGE 1
 #endif
+
+#ifndef HAL_PX4_HAVE_MTD_SUPPORT
+#define HAL_PX4_HAVE_MTD_SUPPORT 1
+#endif
diff --git a/libraries/AP_HAL/board/vrbrain.h b/libraries/AP_HAL/board/vrbrain.h
index a3b2a3a573..32c94e0a7c 100644
--- a/libraries/AP_HAL/board/vrbrain.h
+++ b/libraries/AP_HAL/board/vrbrain.h
@@ -45,3 +45,4 @@
 #define EXTERNAL_LED_MOTOR2       31    // Motor2 LED - AN12
 
 #define HAL_HAVE_BOARD_VOLTAGE 0
+#define HAL_PX4_HAVE_MTD_SUPPORT 1