diff --git a/CHANGELOG b/CHANGELOG
index 1e79fa6d..4e2fcf35 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -80,6 +80,9 @@ HISTORY
 
  ++ Bugfixes:
 
+  2013-06-29: Simon Goldschmidt
+  * inet.h, sockets.h: partially fixed bug #37585: IPv6 compatibility (in socket structs)
+
   2013-06-29: Simon Goldschmidt
   * inet6.h: bug #37585/task #12600: fixed struct in6_addr.s6_addr to conform to spec
 
diff --git a/src/include/ipv4/lwip/inet.h b/src/include/ipv4/lwip/inet.h
index 7bff49b5..ec6d0909 100644
--- a/src/include/ipv4/lwip/inet.h
+++ b/src/include/ipv4/lwip/inet.h
@@ -40,9 +40,14 @@
 extern "C" {
 #endif
 
+/* If your port already typedef's in_addr_t, define IN_ADDR_T_DEFINED
+   to prevent this code from redefining it. */
+#if !defined(in_addr_t) && !defined(IN_ADDR_T_DEFINED)
+typedef u32_t in_addr_t;
+#endif
 /** For compatibility with BSD code */
 struct in_addr {
-  u32_t s_addr;
+  in_addr_t s_addr;
 };
 
 /** 255.255.255.255 */
diff --git a/src/include/lwip/sockets.h b/src/include/lwip/sockets.h
index 73461374..4d6e055a 100644
--- a/src/include/lwip/sockets.h
+++ b/src/include/lwip/sockets.h
@@ -48,33 +48,54 @@
 extern "C" {
 #endif
 
+/* If your port already typedef's sa_family_t, define SA_FAMILY_T_DEFINED
+   to prevent this code from redefining it. */
+#if !defined(sa_family_t) && !defined(SA_FAMILY_T_DEFINED)
+typedef u8_t sa_family_t;
+#endif
+/* If your port already typedef's in_port_t, define IN_PORT_T_DEFINED
+   to prevent this code from redefining it. */
+#if !defined(in_port_t) && !defined(IN_PORT_T_DEFINED)
+typedef u16_t in_port_t;
+#endif
+
 /* members are in network byte order */
 struct sockaddr_in {
-  u8_t sin_len;
-  u8_t sin_family;
-  u16_t sin_port;
-  struct in_addr sin_addr;
+  u8_t            sin_len;
+  sa_family_t     sin_family;
+  in_port_t       sin_port;
+  struct in_addr  sin_addr;
 #define SIN_ZERO_LEN 8
-  char sin_zero[SIN_ZERO_LEN];
+  char            sin_zero[SIN_ZERO_LEN];
 };
 
 #if LWIP_IPV6
 struct sockaddr_in6 {
-  u8_t sin6_len;             /* length of this structure */
-  u8_t sin6_family;          /* AF_INET6                 */
-  u16_t sin6_port;           /* Transport layer port #   */
-  u32_t sin6_flowinfo;       /* IPv6 flow information    */
-  struct in6_addr sin6_addr; /* IPv6 address             */
+  u8_t            sin6_len;      /* length of this structure */
+  sa_family_t     sin6_family;   /* AF_INET6                 */
+  in_port_t       sin6_port;     /* Transport layer port #   */
+  u32_t           sin6_flowinfo; /* IPv6 flow information    */
+  struct in6_addr sin6_addr;     /* IPv6 address             */
 };
 #endif /* LWIP_IPV6 */
 
 struct sockaddr {
-  u8_t sa_len;
-  u8_t sa_family;
+  u8_t        sa_len;
+  sa_family_t sa_family;
 #if LWIP_IPV6
-  u8_t sa_data[22];
+  char        sa_data[22];
 #else /* LWIP_IPV6 */
-  u8_t sa_data[14];
+  char        sa_data[14];
+#endif /* LWIP_IPV6 */
+};
+
+struct sockaddr_storage {
+  u8_t        s2_len;
+  sa_family_t ss_family;
+  char        s2_data1[2];
+  u32_t       s2_data2[3];
+#if LWIP_IPV6
+  u32_t       s2_data3[2];
 #endif /* LWIP_IPV6 */
 };