diff --git a/examples/rpl_udp/rpl.c b/examples/rpl_udp/rpl.c
index 4be9c802e3..6ee6544a5c 100644
--- a/examples/rpl_udp/rpl.c
+++ b/examples/rpl_udp/rpl.c
@@ -90,7 +90,7 @@ void rpl_udp_init(int argc, char **argv)
             return;
         }
 
-        printf("Channel set to %d\n", chan);
+        printf("Channel set to %" PRIi32 "\n", chan);
 
         if (command != 'h') {
             DEBUGF("Initializing RPL for interface 0\n");