diff --git a/src/examples/px4_daemon_app/px4_daemon_app.c b/src/examples/px4_daemon_app/px4_daemon_app.c
index 4dd5165c8c..c568aaadcf 100644
--- a/src/examples/px4_daemon_app/px4_daemon_app.c
+++ b/src/examples/px4_daemon_app/px4_daemon_app.c
@@ -43,6 +43,7 @@
 #include <unistd.h>
 #include <stdio.h>
 
+#include <systemlib/systemlib.h>
 #include <systemlib/err.h>
 
 static bool thread_should_exit = false;		/**< daemon exit flag */