diff --git a/src/examples/px4_simple_app/px4_simple_app.c b/src/examples/px4_simple_app/px4_simple_app.c
index 8c92720d20..5274d50796 100644
--- a/src/examples/px4_simple_app/px4_simple_app.c
+++ b/src/examples/px4_simple_app/px4_simple_app.c
@@ -45,6 +45,7 @@
 #include <stdio.h>
 #include <poll.h>
 #include <string.h>
+#include <math.h>
 
 #include <uORB/uORB.h>
 #include <uORB/topics/sensor_combined.h>