diff --git a/libdnet-stripped/include/config.h.in b/libdnet-stripped/include/config.h.in
index c0d3831f1..0c3fc6aa5 100644
--- a/libdnet-stripped/include/config.h.in
+++ b/libdnet-stripped/include/config.h.in
@@ -309,15 +309,3 @@ char	*strsep(char **, const char *);
 #ifndef HAVE_SOCKLEN_T
 typedef int socklen_t;
 #endif
-
-/* Unix Network Programming, 3rd edition says that sockaddr structures in
-   rt_msghdr should be padded so their addresses start on a multiple of
-   sizeof(u_long). But on 64-bit Mac OS X 10.6 at least, this is false. Apple's
-   netstat code uses 4-byte padding, not 8-byte. This is relevant for IPv6
-   addresses, for which sa_len == 28.
-   http://www.opensource.apple.com/source/network_cmds/network_cmds-329.2.2/netstat.tproj/route.c */
-#ifdef __APPLE__
-#define RT_MSGHDR_ALIGNMENT sizeof(uint32_t)
-#else
-#define RT_MSGHDR_ALIGNMENT sizeof(unsigned long)
-#endif
diff --git a/libdnet-stripped/src/route-bsd.c b/libdnet-stripped/src/route-bsd.c
index 9702422a3..2ca799c15 100644
--- a/libdnet-stripped/src/route-bsd.c
+++ b/libdnet-stripped/src/route-bsd.c
@@ -52,6 +52,17 @@
    http://fxr.watson.org/fxr/ident?v=NETBSD;i=RT_ROUNDUP */
 #define ROUNDUP(a) RT_ROUNDUP(a)
 #else
+/* Unix Network Programming, 3rd edition says that sockaddr structures in
+   rt_msghdr should be padded so their addresses start on a multiple of
+   sizeof(u_long). But on 64-bit Mac OS X 10.6 at least, this is false. Apple's
+   netstat code uses 4-byte padding, not 8-byte. This is relevant for IPv6
+   addresses, for which sa_len == 28.
+   http://www.opensource.apple.com/source/network_cmds/network_cmds-329.2.2/netstat.tproj/route.c */
+#ifdef __APPLE__
+#define RT_MSGHDR_ALIGNMENT sizeof(uint32_t)
+#else
+#define RT_MSGHDR_ALIGNMENT sizeof(unsigned long)
+#endif
 #define ROUNDUP(a) \
 	((a) > 0 ? (1 + (((a) - 1) | (RT_MSGHDR_ALIGNMENT - 1))) : RT_MSGHDR_ALIGNMENT)
 #endif