diff --git a/Platform/CoffeelakeBoardPkg/Library/Stage1BBoardInitLib/Stage1BBoardInitLib.c b/Platform/CoffeelakeBoardPkg/Library/Stage1BBoardInitLib/Stage1BBoardInitLib.c
index a615d262..8200c160 100644
--- a/Platform/CoffeelakeBoardPkg/Library/Stage1BBoardInitLib/Stage1BBoardInitLib.c
+++ b/Platform/CoffeelakeBoardPkg/Library/Stage1BBoardInitLib/Stage1BBoardInitLib.c
@@ -462,7 +462,7 @@ GetPlatformPowerState (
   /// Clear Wake Status
   /// Also clear the PWRBTN_EN, it causes SMI# otherwise (SCI_EN is 0)
   ///
-  IoWrite32 (ACPI_BASE_ADDRESS + R_ACPI_IO_PM1_STS, ((UINT32)~B_ACPI_IO_PM1_EN_PWRBTN_EN & R_ACPI_IO_PM1_EN_MASK) | B_ACPI_IO_PM1_STS_WAK );
+  IoAndThenOr32 (ACPI_BASE_ADDRESS + R_ACPI_IO_PM1_STS, (UINT32)~B_ACPI_IO_PM1_EN_PWRBTN_EN, B_ACPI_IO_PM1_STS_WAK);
 
   if ((MmioRead8 (PCH_PWRM_BASE_ADDRESS + R_PMC_PWRM_GEN_PMCON_B) & B_PMC_PWRM_GEN_PMCON_B_RTC_PWR_STS) != 0) {
     BootMode = BOOT_WITH_FULL_CONFIGURATION;