diff --git a/util/nvmutil/nvmutil.c b/util/nvmutil/nvmutil.c
index 585b4cee..bd343071 100644
--- a/util/nvmutil/nvmutil.c
+++ b/util/nvmutil/nvmutil.c
@@ -98,6 +98,8 @@ static void (*cmd)(void) = NULL;
 int
 main(int argc, char *argv[])
 {
+	mac = NULL;
+
 	argv0 = argv[0];
 	if (argc < 2)
 		usage();