diff --git a/util/nvmutil/nvmutil.c b/util/nvmutil/nvmutil.c
index db13c672..c609ca36 100644
--- a/util/nvmutil/nvmutil.c
+++ b/util/nvmutil/nvmutil.c
@@ -462,7 +462,7 @@ static void
 cmd_setmac(void)
 {
 	size_t partnum;
-	unsigned char mac_updated = 0;
+	uint8_t mac_updated = 0;
 
 	parse_mac_string();
 	printf("MAC address to be written: %s\n", mac_str);