diff --git a/libraries/AP_HAL_SITL/Scheduler.cpp b/libraries/AP_HAL_SITL/Scheduler.cpp
index 6ec8ebdbbe..20d1f1fc0d 100644
--- a/libraries/AP_HAL_SITL/Scheduler.cpp
+++ b/libraries/AP_HAL_SITL/Scheduler.cpp
@@ -10,7 +10,6 @@
 #else
 #include <malloc.h>
 #endif
-#include <AP_Common/Semaphore.h>
 
 using namespace HALSITL;