diff --git a/src/arch/arm/ArmSystem.py b/src/arch/arm/ArmSystem.py
index 112536f907..9755e0d54e 100644
--- a/src/arch/arm/ArmSystem.py
+++ b/src/arch/arm/ArmSystem.py
@@ -134,6 +134,11 @@ class Armv83(Armv82):
         'FEAT_FCMA', 'FEAT_JSCVT', 'FEAT_PAuth',
     ]
 
+class Armv84(Armv83):
+    extensions = Armv83.extensions + [
+        'FEAT_SEL2'
+    ]
+
 class ArmSystem(System):
     type = 'ArmSystem'
     cxx_header = "arch/arm/system.hh"