Use osmocore tlv definition for GSM0808.
diff --git a/openbsc/src/nat/bsc_nat_utils.c b/openbsc/src/nat/bsc_nat_utils.c
index 74d8407..1583306 100644
--- a/openbsc/src/nat/bsc_nat_utils.c
+++ b/openbsc/src/nat/bsc_nat_utils.c
@@ -30,6 +30,7 @@
 
 #include <osmocore/linuxlist.h>
 #include <osmocore/talloc.h>
+#include <osmocore/gsm0808.h>
 
 #include <sccp/sccp.h>