diff --git a/libraries/AP_HAL_Linux/HAL_Linux_Class.cpp b/libraries/AP_HAL_Linux/HAL_Linux_Class.cpp
index cc8174c7d8..02abcab59b 100644
--- a/libraries/AP_HAL_Linux/HAL_Linux_Class.cpp
+++ b/libraries/AP_HAL_Linux/HAL_Linux_Class.cpp
@@ -32,6 +32,7 @@ HAL_Linux::HAL_Linux() :
         &uartADriver,
         &uartBDriver,
         &uartCDriver,
+        NULL,            /* no uartD */
         &i2cDriver,
         &spiDeviceManager,
         &analogIn,