diff --git a/src/extra/ipv4.c b/src/extra/ipv4.c
index 797bab1..37eae7b 100644
--- a/src/extra/ipv4.c
+++ b/src/extra/ipv4.c
@@ -20,6 +20,17 @@
 
 #include "internal.h"
 
+// on debian linux system netinet/ip.h has this define
+// on ndk-sysroot there are only in linux/ip.h but include it
+// introduce an issue on redifinition
+#define IPTOS_CLASS_MASK	0xe0
+#define IPTOS_CLASS(class)	((class) & IPTOS_CLASS_MASK)
+
+#define IPTOS_PREC(tos)		IPTOS_CLASS(tos)
+
+#define	IPTOS_TOS_MASK		0x1E
+#define	IPTOS_TOS(tos)		((tos) & IPTOS_TOS_MASK)
+
 /**
  * \defgroup ipv4 IPv4 helper functions
  * @{