diff --git a/phhgsi_a64_a/BoardConfig.mk b/phhgsi_a64_a/BoardConfig.mk
index 221e881..228e190 100644
--- a/phhgsi_a64_a/BoardConfig.mk
+++ b/phhgsi_a64_a/BoardConfig.mk
@@ -1,5 +1,7 @@
 include build/make/target/board/generic_arm_a/BoardConfig.mk
 include device/phh/treble/board-base.mk
 
+ifeq ($(BOARD_SYSTEMIMAGE_PARTITION_RESERVED_SIZE),)
 BOARD_SYSTEMIMAGE_PARTITION_SIZE := 1572864000
+endif
 TARGET_USES_64_BIT_BINDER := true
diff --git a/phhgsi_arm64_a/BoardConfig.mk b/phhgsi_arm64_a/BoardConfig.mk
index e2465d5..4cf5426 100644
--- a/phhgsi_arm64_a/BoardConfig.mk
+++ b/phhgsi_arm64_a/BoardConfig.mk
@@ -1,4 +1,6 @@
 include build/make/target/board/generic_arm64_a/BoardConfig.mk
 include device/phh/treble/board-base.mk
 
+ifeq ($(BOARD_SYSTEMIMAGE_PARTITION_RESERVED_SIZE),)
 BOARD_SYSTEMIMAGE_PARTITION_SIZE := 2147483648
+endif
diff --git a/phhgsi_arm64_ab/BoardConfig.mk b/phhgsi_arm64_ab/BoardConfig.mk
index 612ff3e..2b59f0f 100644
--- a/phhgsi_arm64_ab/BoardConfig.mk
+++ b/phhgsi_arm64_ab/BoardConfig.mk
@@ -1,4 +1,6 @@
 include build/make/target/board/generic_arm64_ab/BoardConfig.mk
 include device/phh/treble/board-base.mk
 
+ifeq ($(BOARD_SYSTEMIMAGE_PARTITION_RESERVED_SIZE),)
 BOARD_SYSTEMIMAGE_PARTITION_SIZE := 2147483648
+endif
diff --git a/phhgsi_arm_a/BoardConfig.mk b/phhgsi_arm_a/BoardConfig.mk
index 0da0212..2cf15bc 100644
--- a/phhgsi_arm_a/BoardConfig.mk
+++ b/phhgsi_arm_a/BoardConfig.mk
@@ -1,4 +1,6 @@
 include build/make/target/board/generic_arm_a/BoardConfig.mk
 include device/phh/treble/board-base.mk
 
+ifeq ($(BOARD_SYSTEMIMAGE_PARTITION_RESERVED_SIZE),)
 BOARD_SYSTEMIMAGE_PARTITION_SIZE := 1572864000
+endif
diff --git a/phhgsi_arm_ab/BoardConfig.mk b/phhgsi_arm_ab/BoardConfig.mk
index 1df6cd1..18aaace 100644
--- a/phhgsi_arm_ab/BoardConfig.mk
+++ b/phhgsi_arm_ab/BoardConfig.mk
@@ -1,4 +1,6 @@
 include build/make/target/board/generic_arm_ab/BoardConfig.mk
 include device/phh/treble/board-base.mk
 
+ifeq ($(BOARD_SYSTEMIMAGE_PARTITION_RESERVED_SIZE),)
 BOARD_SYSTEMIMAGE_PARTITION_SIZE := 1073741824
+endif