diff --git a/include/config.h b/include/config.h
index 587e0e049..07d31a94b 100644
--- a/include/config.h
+++ b/include/config.h
@@ -70,6 +70,11 @@
 
 #undef NO_FDLIST
 
+/*
+ * system have sockaddr_storage struct. 
+ */
+#define HAVE_STRUCT_SOCKADDR_STORAGE 1
+
 /*
  * Defining this will allow all ircops to see people in +s channels
  * By default, only net/tech admins can see this