diff --git a/ArmPkg/Drivers/ArmGic/GicV3/Arm/ArmGicV3.S b/ArmPkg/Drivers/ArmGic/GicV3/Arm/ArmGicV3.S
index a72f3c8651..c308d2fa3e 100644
--- a/ArmPkg/Drivers/ArmGic/GicV3/Arm/ArmGicV3.S
+++ b/ArmPkg/Drivers/ArmGic/GicV3/Arm/ArmGicV3.S
@@ -66,7 +66,7 @@ ASM_FUNC(ArmGicV3EndOfInterrupt)
 //  VOID
 //  );
 ASM_FUNC(ArmGicV3AcknowledgeInterrupt)
-        mrc     p15, 0, r0, c12, c8, 0 //ICC_IAR1
+        mrc     p15, 0, r0, c12, c12, 0 //ICC_IAR1
         bx      lr
 
 //VOID
diff --git a/ArmPkg/Drivers/ArmGic/GicV3/Arm/ArmGicV3.asm b/ArmPkg/Drivers/ArmGic/GicV3/Arm/ArmGicV3.asm
index 4228fb59be..222047d1ad 100644
--- a/ArmPkg/Drivers/ArmGic/GicV3/Arm/ArmGicV3.asm
+++ b/ArmPkg/Drivers/ArmGic/GicV3/Arm/ArmGicV3.asm
@@ -66,7 +66,7 @@
 //  VOID
 //  );
  RVCT_ASM_EXPORT ArmGicV3AcknowledgeInterrupt
-        mrc     p15, 0, r0, c12, c8, 0 //ICC_IAR1
+        mrc     p15, 0, r0, c12, c12, 0 //ICC_IAR1
         bx      lr
 
 //VOID