diff --git a/core/main.mk b/core/main.mk
index f9aad2b..651ba98 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -390,6 +390,7 @@
 ifneq (,$(user_variant))
   # Target is secure in user builds.
   ADDITIONAL_DEFAULT_PROPERTIES += ro.secure=1
+  ADDITIONAL_DEFAULT_PROPERTIES += security.perf_harden=1
 
   ifeq ($(user_variant),user)
     ADDITIONAL_DEFAULT_PROPERTIES += ro.adb.secure=1