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-rw-r--r--src/include/ipxe/ndp.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/include/ipxe/ndp.h b/src/include/ipxe/ndp.h
index 464dab333..7388f938e 100644
--- 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