diff --git a/infrastructure-centred/owlps-aggregator/owlps-aggregatord.c b/infrastructure-centred/owlps-aggregator/owlps-aggregatord.c
index f7cf130..d603e9e 100644
--- a/infrastructure-centred/owlps-aggregator/owlps-aggregatord.c
+++ b/infrastructure-centred/owlps-aggregator/owlps-aggregatord.c
@@ -23,6 +23,7 @@ int main(int argc, char **argv)
   struct sigaction action ; // Signal handler structure
   pthread_t
     monitor_thread, // Aggregated data monitoring thread
+    monitor_aps_thread, // APs monitoring thread
     autocalibration_hello_thread ; // Hello messages reception thread
   unsigned int listening_port ;
   int sockfd ; // UDP listening socket
@@ -51,6 +52,8 @@ int main(int argc, char **argv)
                  (void *) &monitor_couples, NULL) ;
   pthread_create(&autocalibration_hello_thread, NULL,
                  (void *) &listen_for_aps, NULL) ;
+  pthread_create(&monitor_aps_thread, NULL,
+                 (void *) &monitor_aps, NULL) ;
 
   run = TRUE ;
   ret = read_loop(sockfd) ;
@@ -798,6 +801,10 @@ void push_ap(ap_list *ap)
  */
 void monitor_aps()
 {
+#ifdef DEBUG
+  fprintf(stderr, "Monitor AP thread launched.\n") ;
+#endif // DEBUG
+
   while (run)
     {
       delete_old_aps() ;