diff --git a/ArmPkg/Drivers/ArmGic/ArmGicNonSecLib.c b/ArmPkg/Drivers/ArmGic/ArmGicNonSecLib.c
index 31572438d9..f90391b716 100644
--- a/ArmPkg/Drivers/ArmGic/ArmGicNonSecLib.c
+++ b/ArmPkg/Drivers/ArmGic/ArmGicNonSecLib.c
@@ -33,9 +33,9 @@ ArmGicEnableDistributor (
     MmioWrite32 (GicDistributorBase + ARM_GIC_ICDDCR, 0x1);
   } else {
     if (MmioRead32 (GicDistributorBase + ARM_GIC_ICDDCR) & ARM_GIC_ICDDCR_ARE) {
-      MmioWrite32 (GicDistributorBase + ARM_GIC_ICDDCR, 0x2);
+      MmioOr32 (GicDistributorBase + ARM_GIC_ICDDCR, 0x2);
     } else {
-      MmioWrite32 (GicDistributorBase + ARM_GIC_ICDDCR, 0x1);
+      MmioOr32 (GicDistributorBase + ARM_GIC_ICDDCR, 0x1);
     }
   }
 }