diff --git a/libraries/AP_HAL_AVR_SITL/Scheduler.cpp b/libraries/AP_HAL_AVR_SITL/Scheduler.cpp
index c3894674e4..e6e1f01d86 100644
--- a/libraries/AP_HAL_AVR_SITL/Scheduler.cpp
+++ b/libraries/AP_HAL_AVR_SITL/Scheduler.cpp
@@ -8,8 +8,6 @@
 #include <sys/time.h>
 #include <unistd.h>
 #include <fenv.h>
-#include <signal.h>
-#include <pthread.h>
 
 using namespace AVR_SITL;