[ipv6] Fix compilation under FreeBSD

Reported-by: Dewey Hylton <dewey@hyltown.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

diff --git a/src/include/ipxe/ndp.h b/src/include/ipxe/ndp.h
index 464dab333139a86270f36add88873fd99e27f6d6..7388f938eb093554f71432580513e8fd09db4807 100644 (file)
--- a/src/include/ipxe/ndp.h
+++ b/src/include/ipxe/ndp.h
@@ -24,7 +24,7 @@ struct ndp_option_header {
 } __attribute__ (( packed ));
 
 /** NDP option block size */
-#define NDP_OPTION_BLKSZ 8
+#define NDP_OPTION_BLKSZ 8U
 
 /** NDP source link-layer address option */
 #define NDP_OPT_LL_SOURCE 1