diff --git a/ArmPlatformPkg/ArmVExpressPkg/ArmVExpress-RTSM-AEMv8Ax4-foundation.dsc b/ArmPlatformPkg/ArmVExpressPkg/ArmVExpress-RTSM-AEMv8Ax4-foundation.dsc
index 8125134b14..212ee45441 100644
--- a/ArmPlatformPkg/ArmVExpressPkg/ArmVExpress-RTSM-AEMv8Ax4-foundation.dsc
+++ b/ArmPlatformPkg/ArmVExpressPkg/ArmVExpress-RTSM-AEMv8Ax4-foundation.dsc
@@ -99,6 +99,9 @@
   #
   gArmTokenSpaceGuid.PcdArmUncachedMemoryMask|0x0000000040000000
 
+  ## Trustzone enable (to make the transition from EL3 to EL2 in ArmPlatformPkg/Sec)
+  gArmTokenSpaceGuid.PcdTrustzoneSupport|TRUE
+
   #
   # ARM PrimeCell
   #
diff --git a/ArmPlatformPkg/ArmVExpressPkg/ArmVExpress-RTSM-AEMv8Ax4.dsc b/ArmPlatformPkg/ArmVExpressPkg/ArmVExpress-RTSM-AEMv8Ax4.dsc
index 828987fed1..34b6fcbe9a 100644
--- a/ArmPlatformPkg/ArmVExpressPkg/ArmVExpress-RTSM-AEMv8Ax4.dsc
+++ b/ArmPlatformPkg/ArmVExpressPkg/ArmVExpress-RTSM-AEMv8Ax4.dsc
@@ -107,8 +107,8 @@
   #
   gArmTokenSpaceGuid.PcdArmUncachedMemoryMask|0x0000000040000000
 
-  ## Trustzone enable
-  # gArmTokenSpaceGuid.PcdTrustzoneSupport|TRUE
+  ## Trustzone enable (to make the transition from EL3 to EL2 in ArmPlatformPkg/Sec)
+  gArmTokenSpaceGuid.PcdTrustzoneSupport|TRUE
  
   #
   # ARM PrimeCell