diff --git a/infrastructure-centred/owlps-aggregator/owlps-aggregatord.c b/infrastructure-centred/owlps-aggregator/owlps-aggregatord.c
index 899c572..2bd2633 100644
--- a/infrastructure-centred/owlps-aggregator/owlps-aggregatord.c
+++ b/infrastructure-centred/owlps-aggregator/owlps-aggregatord.c
@@ -693,6 +693,7 @@ void listen_for_aps(void)
   struct sockaddr_in client; // UDP client structure
   socklen_t client_len = sizeof(client) ; // Size of clients
   autocalibration_hello message ;
+  char ap_ip_addr[16] ;
 
 #ifdef DEBUG
   fprintf(stderr, "Autocalibration Hello thread launched.\n") ;
@@ -720,11 +721,14 @@ void listen_for_aps(void)
           continue ;
         }
 
+      strncpy(ap_ip_addr, inet_ntoa(client.sin_addr), 16) ;
+
 #ifdef DEBUG
-      fprintf(stderr, "Got a Hello message.\n") ;
+      fprintf(stderr, "Got a Hello message from « %s »\n",
+              ap_ip_addr) ;
 #endif // DEBUG
 
-      update_ap(message.ap_mac_addr_bytes, message.ap_ip_addr) ;
+      update_ap(message.ap_mac_addr_bytes, ap_ip_addr) ;
     }
 
   (void) close(listen_sockfd) ;
diff --git a/infrastructure-centred/owlps-listener/owlps-listenerd.c b/infrastructure-centred/owlps-listener/owlps-listenerd.c
index 1e9b432..f462da6 100644
--- a/infrastructure-centred/owlps-listener/owlps-listenerd.c
+++ b/infrastructure-centred/owlps-listener/owlps-listenerd.c
@@ -925,7 +925,6 @@ void autocalibrate_hello()
                                       &serv, NULL) ;
 
   memcpy(&message.ap_mac_addr_bytes, my_mac, 6) ;
-  strncpy(message.ap_ip_addr, my_ip, 16) ;
 
   while (run)
     {
diff --git a/libowlps/owlps.h b/libowlps/owlps.h
index 421e225..2ab5094 100644
--- a/libowlps/owlps.h
+++ b/libowlps/owlps.h
@@ -92,7 +92,6 @@ typedef struct _request
 typedef struct _autocalibration_hello
 {
   unsigned char ap_mac_addr_bytes[6];
-  char ap_ip_addr[16] ;
 } autocalibration_hello ;
 
 typedef struct _autocalibration_order