diff --git a/libraries/AP_HAL_Linux/HAL_Linux_Class.cpp b/libraries/AP_HAL_Linux/HAL_Linux_Class.cpp
index c44099b7d7..b9d18dec3f 100644
--- a/libraries/AP_HAL_Linux/HAL_Linux_Class.cpp
+++ b/libraries/AP_HAL_Linux/HAL_Linux_Class.cpp
@@ -249,7 +249,8 @@ HAL_Linux::HAL_Linux() :
         &rcoutDriver,
         &schedulerInstance,
         &utilInstance,
-        &opticalFlow)
+        &opticalFlow,
+        nullptr)
 {}
 
 void _usage(void)