diff --git a/target/board/BoardConfigEmuCommon.mk b/target/board/BoardConfigEmuCommon.mk
index 5acbe7f136..7a07d70bba 100644
--- a/target/board/BoardConfigEmuCommon.mk
+++ b/target/board/BoardConfigEmuCommon.mk
@@ -34,7 +34,7 @@ ifeq ($(PRODUCT_USE_DYNAMIC_PARTITIONS),true)
   BOARD_BUILD_SUPER_IMAGE_BY_DEFAULT := true
 
   # 8G + 8M
-  BOARD_SUPER_PARTITION_SIZE := 8598323200
+  BOARD_SUPER_PARTITION_SIZE ?= 8598323200
   BOARD_SUPER_PARTITION_GROUPS := emulator_dynamic_partitions
 
   ifeq ($(QEMU_USE_SYSTEM_EXT_PARTITIONS),true)
@@ -57,7 +57,7 @@ ifeq ($(PRODUCT_USE_DYNAMIC_PARTITIONS),true)
   endif
 
   # 8G
-  BOARD_EMULATOR_DYNAMIC_PARTITIONS_SIZE := 8589934592
+  BOARD_EMULATOR_DYNAMIC_PARTITIONS_SIZE ?= 8589934592
 
   # in build environment to speed up make -j
   ifeq ($(QEMU_DISABLE_AVB),true)