diff --git a/src/superio/winbond/w83977tf/acpi/superio.asl b/src/superio/winbond/w83977tf/acpi/superio.asl
index cd514d07df..6e37a5bbc1 100644
--- a/src/superio/winbond/w83977tf/acpi/superio.asl
+++ b/src/superio/winbond/w83977tf/acpi/superio.asl
@@ -350,6 +350,8 @@ Device (ECP)
 	#define SUPERIO_UART_LDN W83977TF_SP1
 	#define SUPERIO_UART_PM_REG UAPW
 	#include <superio/acpi/pnp_uart.asl>
+	#undef SUPERIO_UART_LDN
+	#undef SUPERIO_UART_PM_REG
 #endif
 
 #ifdef SUPERIO_SHOW_UARTB