diff --git a/examples/udp-receiver-ipv6/example-udp-receiver.c b/examples/udp-receiver-ipv6/example-udp-receiver.c
index 381795053..0ad8015a7 100644
--- a/examples/udp-receiver-ipv6/example-udp-receiver.c
+++ b/examples/udp-receiver-ipv6/example-udp-receiver.c
@@ -59,7 +59,7 @@ udphandler(process_event_t ev, process_data_t data)
   if (ev == tcpip_event) {
     if(uip_newdata()) {
       ((char *)uip_appdata)[uip_datalen()] = 0;
-      printf("Receiver received: '%s'\n", uip_appdata);
+      printf("Receiver received: '%s'\n", (char *)uip_appdata);
     }
   }
 
diff --git a/examples/udp-sender-ipv6/example-udp-sender.c b/examples/udp-sender-ipv6/example-udp-sender.c
index 8f9ce59d6..74ead768b 100644
--- a/examples/udp-sender-ipv6/example-udp-sender.c
+++ b/examples/udp-sender-ipv6/example-udp-sender.c
@@ -68,7 +68,7 @@ udphandler(process_event_t ev, process_data_t data)
   if(ev == tcpip_event) {
     if(uip_newdata()) {
       ((char *)uip_appdata)[uip_datalen()] = 0;
-      printf("Sender received: '%s'\n", uip_appdata);
+      printf("Sender received: '%s'\n", (char *)uip_appdata);
     }
   }