diff --git a/libraries/AP_BattMonitor/AP_BattMonitor_UAVCAN.cpp b/libraries/AP_BattMonitor/AP_BattMonitor_UAVCAN.cpp
index b4ba7d2a6d..c19e57fc81 100644
--- a/libraries/AP_BattMonitor/AP_BattMonitor_UAVCAN.cpp
+++ b/libraries/AP_BattMonitor/AP_BattMonitor_UAVCAN.cpp
@@ -7,7 +7,6 @@
 
 #include <AP_BoardConfig/AP_BoardConfig_CAN.h>
 #include <AP_Common/AP_Common.h>
-#include <AP_Common/Semaphore.h>
 #include <AP_Math/AP_Math.h>
 #include <AP_UAVCAN/AP_UAVCAN.h>