diff --git a/core/net/ip/tcp-socket.c b/core/net/ip/tcp-socket.c
index eac008cde..d697ccdd9 100644
--- a/core/net/ip/tcp-socket.c
+++ b/core/net/ip/tcp-socket.c
@@ -29,6 +29,9 @@
  *
  */
 
+#define DEBUG DEBUG_NONE
+#include "net/ip/uip-debug.h"
+
 #include "contiki.h"
 #include "sys/cc.h"
 #include "contiki-net.h"
@@ -37,10 +40,8 @@
 
 #include "tcp-socket.h"
 
-#include <stdio.h>
 #include <string.h>
 
-
 static void relisten(struct tcp_socket *s);
 
 LIST(socketlist);
@@ -80,7 +81,7 @@ acked(struct tcp_socket *s)
              s->output_data_maxlen - s->output_data_send_nxt);
     }
     if(s->output_data_len < s->output_data_send_nxt) {
-      printf("tcp: acked assertion failed s->output_data_len (%d) < s->output_data_send_nxt (%d)\n",
+      PRINTF("tcp: acked assertion failed s->output_data_len (%d) < s->output_data_send_nxt (%d)\n",
              s->output_data_len,
              s->output_data_send_nxt);
       tcp_markconn(uip_conn, NULL);
@@ -121,7 +122,7 @@ newdata(struct tcp_socket *s)
       bytesleft = 0;
     }
     if(bytesleft > 0) {
-      printf("tcp: newdata, bytesleft > 0 (%d) not implemented\n", bytesleft);
+      PRINTF("tcp: newdata, bytesleft > 0 (%d) not implemented\n", bytesleft);
     }
     dataptr += copylen;
     len -= copylen;