diff --git a/sys/net/network_layer/ng_ipv6/nc/ng_ipv6_nc.c b/sys/net/network_layer/ng_ipv6/nc/ng_ipv6_nc.c
index c76ec8d8ea..98a125bf15 100644
--- a/sys/net/network_layer/ng_ipv6/nc/ng_ipv6_nc.c
+++ b/sys/net/network_layer/ng_ipv6/nc/ng_ipv6_nc.c
@@ -29,6 +29,9 @@
 #include "debug.h"
 
 #if ENABLE_DEBUG
+/* For PRIu8 etc. */
+#include <inttypes.h>
+
 static char addr_str[NG_IPV6_ADDR_MAX_STR_LEN];
 #endif