diff --git a/shared/BoardConfig.mk b/shared/BoardConfig.mk
index 9b30d43..6be1730 100644
--- a/shared/BoardConfig.mk
+++ b/shared/BoardConfig.mk
@@ -114,9 +114,9 @@
 BOARD_MALLOC_ALIGNMENT := 16
 
 # Disable sparse on all filesystem images
-TARGET_USERIMAGES_SPARSE_EROFS_DISABLED := true
-TARGET_USERIMAGES_SPARSE_EXT_DISABLED := true
-TARGET_USERIMAGES_SPARSE_F2FS_DISABLED := true
+TARGET_USERIMAGES_SPARSE_EROFS_DISABLED ?= true
+TARGET_USERIMAGES_SPARSE_EXT_DISABLED ?= true
+TARGET_USERIMAGES_SPARSE_F2FS_DISABLED ?= true
 
 # Make the userdata partition 6G to accommodate ASAN and CTS
 BOARD_USERDATAIMAGE_PARTITION_SIZE := $(TARGET_USERDATAIMAGE_PARTITION_SIZE)