diff --git a/sw/airborne/main.c b/sw/airborne/main.c
index 267fe4061a..f93e4a0d01 100644
--- a/sw/airborne/main.c
+++ b/sw/airborne/main.c
@@ -44,6 +44,7 @@
 int main( void ) {
   Fbw(init);
   Ap(init);
+  InitSysTimePeriodic()
   while (1) {
     if (sys_time_periodic()) {
       Fbw(periodic_task);