diff --git a/core/AmUtils.h b/core/AmUtils.h
index 46e5c5e7..66d79df7 100644
--- a/core/AmUtils.h
+++ b/core/AmUtils.h
@@ -286,6 +286,20 @@ std::vector <string> explode(string s, string e);
 /** add a directory to an environement variable */
 void add_env_path(const char* name, const string& path);
 
+#ifdef SUPPORT_IPV6
+#ifdef SIN6_LEN
+#define SOCKADDR_LEN(soc_address) ((struct sockaddr *)&soc_address)->sa_len
+#else
+#ifndef SA_LEN
+#define SA_LEN(x) (((x)->sa_family == AF_INET6)?sizeof(struct sockaddr_in6): \
+       (((x)->sa_family == AF_INET)?sizeof(struct sockaddr_in):sizeof(struct sockaddr)))
+#endif
+#define SOCKADDR_LEN(soc_address) SA_LEN((struct sockaddr *)&soc_address)
+#endif /* SIN6_LEN */
+#else
+#define SOCKADDR_LEN(soc_address) sizeof(soc_address)
+#endif /* SUPPORT_IPV6 */
+
 #endif
 
 // Local Variables:
diff --git a/core/sems.cpp b/core/sems.cpp
index ff51c60b..0e80c34c 100644
--- a/core/sems.cpp
+++ b/core/sems.cpp
@@ -455,7 +455,7 @@ static void getInterfaceList(int sd, std::vector<std::pair<string,string> >& if_
  				  inet_ntoa(sa->sin_addr)));
     }
 
-    p_ifr = (struct ifreq*)(((char*)p_ifr) + IFNAMSIZ + p_ifr->ifr_addr.sa_len); 
+    p_ifr = (struct ifreq*)(((char*)p_ifr) + IFNAMSIZ + SOCKADDR_LEN(p_ifr->ifr_addr)); 
   }
   
 }