diff --git a/phhgsi_arm64_a/BoardConfig.mk b/phhgsi_arm64_a/BoardConfig.mk
index 00a5e55..0332d3d 100644
--- a/phhgsi_arm64_a/BoardConfig.mk
+++ b/phhgsi_arm64_a/BoardConfig.mk
@@ -1,4 +1,4 @@
 include build/make/target/board/generic_arm64_a/BoardConfig.mk
 
 BOARD_SYSTEMIMAGE_PARTITION_SIZE := 2147483648
-TARGET_SYSTEM_PROP += device/phh/treble/system.prop
+TARGET_SYSTEM_PROP := device/phh/treble/system.prop $(TARGET_SYSTEM_PROP)
diff --git a/phhgsi_arm64_ab/BoardConfig.mk b/phhgsi_arm64_ab/BoardConfig.mk
index d06763b..f2553e4 100644
--- a/phhgsi_arm64_ab/BoardConfig.mk
+++ b/phhgsi_arm64_ab/BoardConfig.mk
@@ -1,4 +1,4 @@
 include build/make/target/board/generic_arm64_ab/BoardConfig.mk
 
 BOARD_SYSTEMIMAGE_PARTITION_SIZE := 2147483648
-TARGET_SYSTEM_PROP += device/phh/treble/system.prop
+TARGET_SYSTEM_PROP := device/phh/treble/system.prop $(TARGET_SYSTEM_PROP)