diff --git a/arch/x86/cpu/slimbootloader/serial.c b/arch/x86/cpu/slimbootloader/serial.c
index 5d89632..ebbd2c5 100644
--- a/arch/x86/cpu/slimbootloader/serial.c
+++ b/arch/x86/cpu/slimbootloader/serial.c
@@ -59,7 +59,7 @@
 	.of_match = slimbootloader_serial_ids,
 	.of_to_plat = slimbootloader_serial_of_to_plat,
 	.plat_auto	= sizeof(struct ns16550_plat),
-	.priv_auto	= sizeof(struct NS16550),
+	.priv_auto	= sizeof(struct ns16550),
 	.probe	= ns16550_serial_probe,
 	.ops	= &ns16550_serial_ops,
 };