diff --git a/libraries/AP_HAL_VRBRAIN/HAL_VRBRAIN_Class.cpp b/libraries/AP_HAL_VRBRAIN/HAL_VRBRAIN_Class.cpp
index decd5abf26..23cf63e615 100644
--- a/libraries/AP_HAL_VRBRAIN/HAL_VRBRAIN_Class.cpp
+++ b/libraries/AP_HAL_VRBRAIN/HAL_VRBRAIN_Class.cpp
@@ -108,6 +108,7 @@ HAL_VRBRAIN::HAL_VRBRAIN() :
         &uartCDriver,  /* uartC */
         &uartDDriver,  /* uartD */
         &uartEDriver,  /* uartE */
+        NULL, // uartF
         &i2c_mgr_instance,
         &i2cDriver, /* Empty i2c */
         &i2cDriver, /* Empty i2c */