diff --git a/make_helpers/arch_features.mk b/make_helpers/arch_features.mk
index 8dec522..56bfb64 100644
--- a/make_helpers/arch_features.mk
+++ b/make_helpers/arch_features.mk
@@ -419,6 +419,9 @@
 # Flag to enable Floating point exception Mode Register Feature (FEAT_FPMR)
 ENABLE_FEAT_FPMR			?=	0
 
+# Flag to enable Memory Encryption Contexts (FEAT_MEC).
+ENABLE_FEAT_MEC				?=	0
+
 #----
 # 9.3
 #----