diff --git a/util/nvramtool/coreboot_tables.h b/util/nvramtool/coreboot_tables.h
index 08f0be6..22570ac 100644
--- a/util/nvramtool/coreboot_tables.h
+++ b/util/nvramtool/coreboot_tables.h
@@ -74,7 +74,10 @@
 }
 
 struct lb_header {
-	uint8_t signature[4];	/* LBIO */
+	union {
+		uint8_t signature[4];	/* LBIO */
+		uint32_t signature32;
+	};
 	uint32_t header_bytes;
 	uint32_t header_checksum;
 	uint32_t table_bytes;