diff --git a/libraries/AP_HAL_Empty/HAL_Empty_Class.cpp b/libraries/AP_HAL_Empty/HAL_Empty_Class.cpp
index 7aa24f0957..b2271a7df8 100644
--- a/libraries/AP_HAL_Empty/HAL_Empty_Class.cpp
+++ b/libraries/AP_HAL_Empty/HAL_Empty_Class.cpp
@@ -34,6 +34,7 @@ HAL_Empty::HAL_Empty() :
         nullptr,            /* no uartG */
         nullptr,            /* no uartH */
         nullptr,            /* no uartI */
+        nullptr,            /* no uartJ */
         &spiDeviceManager,
         &analogIn,
         &storageDriver,