diff --git a/drivers/acpi/acpica/utosi.c b/drivers/acpi/acpica/utosi.c
index f90d00e384dfafb931f1bba842a18ecf2773882d..902a47463abf992b249ee81e33af0145b5ddc3de 100644
--- a/drivers/acpi/acpica/utosi.c
+++ b/drivers/acpi/acpica/utosi.c
@@ -71,6 +71,7 @@ static struct acpi_interface_info acpi_default_supported_interfaces[] = {
 	{"Windows 2017", NULL, 0, ACPI_OSI_WIN_10_RS2},	/* Windows 10 version 1703 - Added 12/2017 */
 	{"Windows 2017.2", NULL, 0, ACPI_OSI_WIN_10_RS3},	/* Windows 10 version 1709 - Added 02/2018 */
 	{"Windows 2018", NULL, 0, ACPI_OSI_WIN_10_RS4},	/* Windows 10 version 1803 - Added 11/2018 */
+	{"Windows 2018.2", NULL, 0, ACPI_OSI_WIN_10_RS5},	/* Windows 10 version 1809 - Added 11/2018 */
 
 	/* Feature Group Strings */
 
diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
index 7dbd7a65e13592d8cfdf4289fb54e46c86758f2e..91ff73e99bbde293956b2a0e0bc2577109c7887f 100644
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -1274,6 +1274,7 @@ typedef enum {
 #define ACPI_OSI_WIN_10_RS2             0x0F
 #define ACPI_OSI_WIN_10_RS3             0x10
 #define ACPI_OSI_WIN_10_RS4             0x11
+#define ACPI_OSI_WIN_10_RS5             0x12
 
 /* Definitions of getopt */