diff --git a/libraries/SITL/SIM_Gazebo.cpp b/libraries/SITL/SIM_Gazebo.cpp
index bf32962b1b..52c1cc09b3 100644
--- a/libraries/SITL/SIM_Gazebo.cpp
+++ b/libraries/SITL/SIM_Gazebo.cpp
@@ -23,10 +23,6 @@
 #include <stdio.h>
 #include <errno.h>
 
-#include <AP_HAL/AP_HAL.h>
-
-extern const AP_HAL::HAL& hal;
-
 namespace SITL {
 
 Gazebo::Gazebo(const char *frame_str) :