diff --git a/src/mainboard/google/auron/acpi/superio.asl b/src/mainboard/google/auron/acpi/superio.asl
index e3a31bc657..42eaba1825 100644
--- a/src/mainboard/google/auron/acpi/superio.asl
+++ b/src/mainboard/google/auron/acpi/superio.asl
@@ -6,7 +6,6 @@
 #define SIO_EC_MEMMAP_ENABLE     // EC Memory Map Resources
 #define SIO_EC_HOST_ENABLE       // EC Host Interface Resources
 #define SIO_EC_ENABLE_PS2K       // Enable PS/2 Keyboard
-#define SIO_EC_ENABLE_COM1       // Enable Serial Port 1
 
 /* ACPI code for EC SuperIO functions */
 #include <ec/google/chromeec/acpi/superio.asl>
diff --git a/src/mainboard/google/link/acpi/superio.asl b/src/mainboard/google/link/acpi/superio.asl
index 0dc0696336..b30da54749 100644
--- a/src/mainboard/google/link/acpi/superio.asl
+++ b/src/mainboard/google/link/acpi/superio.asl
@@ -6,7 +6,6 @@
 #define SIO_EC_MEMMAP_ENABLE     // EC Memory Map Resources
 #define SIO_EC_HOST_ENABLE       // EC Host Interface Resources
 #define SIO_EC_ENABLE_PS2K       // Enable PS/2 Keyboard
-#define SIO_EC_ENABLE_COM1       // Enable Serial Port 1
 
 /* ACPI code for EC SuperIO functions */
 #include "../../../../ec/google/chromeec/acpi/superio.asl"
diff --git a/src/mainboard/google/slippy/acpi/superio.asl b/src/mainboard/google/slippy/acpi/superio.asl
index 587bb8bf0f..4a1456bb0e 100644
--- a/src/mainboard/google/slippy/acpi/superio.asl
+++ b/src/mainboard/google/slippy/acpi/superio.asl
@@ -6,7 +6,6 @@
 #define SIO_EC_MEMMAP_ENABLE     // EC Memory Map Resources
 #define SIO_EC_HOST_ENABLE       // EC Host Interface Resources
 #define SIO_EC_ENABLE_PS2K       // Enable PS/2 Keyboard
-#define SIO_EC_ENABLE_COM1       // Enable Serial Port 1
 
 /* ACPI code for EC SuperIO functions */
 #include <ec/google/chromeec/acpi/superio.asl>