diff --git a/make_helpers/defaults.mk b/make_helpers/defaults.mk
index e88148f..595ba7b 100644
--- a/make_helpers/defaults.mk
+++ b/make_helpers/defaults.mk
@@ -136,6 +136,9 @@
 # Flag to enable access to the HCRX_EL2 register by setting SCR_EL3.HXEn.
 ENABLE_FEAT_HCX			:= 0
 
+# Flag to enable access to the HAFGRTR_EL2 register
+ENABLE_FEAT_AMUv1		:= 0
+
 # By default BL31 encryption disabled
 ENCRYPT_BL31			:= 0