diff --git a/src/propsheet/sources b/src/propsheet/sources
index 34192247d9..10cd297de0 100644
--- a/src/propsheet/sources
+++ b/src/propsheet/sources
@@ -1,3 +1,5 @@
+ARM64X_EC_ENABLED=1
+
 !include ..\project.inc
 
 # -------------------------------------
diff --git a/src/propslib/sources b/src/propslib/sources
index d1557afb12..0788386567 100644
--- a/src/propslib/sources
+++ b/src/propslib/sources
@@ -1,3 +1,5 @@
+ARM64X_EC_ENABLED=1
+
 !include ..\project.inc
 
 # -------------------------------------