diff --git a/libraries/AP_Notify/ToneAlarm_Linux.cpp b/libraries/AP_Notify/ToneAlarm_Linux.cpp
index 5caf734adc..85a1558305 100644
--- a/libraries/AP_Notify/ToneAlarm_Linux.cpp
+++ b/libraries/AP_Notify/ToneAlarm_Linux.cpp
@@ -27,7 +27,7 @@
 #include <fcntl.h>
 #include <unistd.h>
 
-#include "../AP_HAL_Linux/Util.h"
+#include <AP_HAL_Linux/Util.h>
 #include <stdio.h>
 #include <errno.h>