diff --git a/include/net/net_ip.h b/include/net/net_ip.h
index 0083436911a..c33759db274 100644
--- a/include/net/net_ip.h
+++ b/include/net/net_ip.h
@@ -79,27 +79,20 @@ enum net_sock_type {
 /** IPv6 address structure */
 struct in6_addr {
 	union {
-		u8_t		u6_addr8[16];
-		u16_t		u6_addr16[8]; /* In big endian */
-		u32_t		u6_addr32[4]; /* In big endian */
-	} in6_u;
-#define s6_addr			in6_u.u6_addr8
-#define s6_addr16		in6_u.u6_addr16
-#define s6_addr32		in6_u.u6_addr32
+		u8_t s6_addr[16];
+		u16_t s6_addr16[8]; /* In big endian */
+		u32_t s6_addr32[4]; /* In big endian */
+	};
 };
 
 /** IPv4 address */
 struct in_addr {
 	union {
-		u8_t		u4_addr8[4];
-		u16_t		u4_addr16[2]; /* In big endian */
-		u32_t		u4_addr32[1]; /* In big endian */
-	} in4_u;
-#define s4_addr			in4_u.u4_addr8
-#define s4_addr16		in4_u.u4_addr16
-#define s4_addr32		in4_u.u4_addr32
-
-#define s_addr			s4_addr32[0]
+		u8_t s4_addr[4];
+		u16_t s4_addr16[2]; /* In big endian */
+		u32_t s4_addr32[1]; /* In big endian */
+		u32_t s_addr; /* In big endian, for POSIX compatibility. */
+	};
 };
 
 typedef unsigned short int sa_family_t;