diff --git a/OvmfPkg/AcpiTables/Platform.h b/OvmfPkg/AcpiTables/Platform.h
index 6b6d001190..4b03897614 100644
--- a/OvmfPkg/AcpiTables/Platform.h
+++ b/OvmfPkg/AcpiTables/Platform.h
@@ -58,7 +58,7 @@
 #define DAY_ALRM        0x00
 #define MON_ALRM        0x00
 #define CENTURY         0x00
-#define FLAG            EFI_ACPI_1_0_WBINVD | EFI_ACPI_1_0_PROC_C1 | EFI_ACPI_1_0_SLP_BUTTON | EFI_ACPI_1_0_RTC_S4 | EFI_ACPI_1_0_TMR_VAL_EXT
+#define FLAG            EFI_ACPI_1_0_WBINVD | EFI_ACPI_1_0_PROC_C1 | EFI_ACPI_1_0_SLP_BUTTON | EFI_ACPI_1_0_RTC_S4
 
 #endif