diff --git a/core/dex_preopt_libart.mk b/core/dex_preopt_libart.mk
index 90ba543..8fc0c67 100644
--- a/core/dex_preopt_libart.mk
+++ b/core/dex_preopt_libart.mk
@@ -27,14 +27,14 @@
 LIBART_IMG_TARGET_BASE_ADDRESS := 0x70000000
 endif
 
-define get-product-property
-  $(strip $(patsubst $(1)=%,%,$(filter $(1)=%,$(PRODUCT_PROPERTY_OVERRIDES))))
+define get-product-default-property
+$(strip $(patsubst $(1)=%,%,$(filter $(1)=%,$(PRODUCT_DEFAULT_PROPERTY_OVERRIDES))))
 endef
 
-DEX2OAT_IMAGE_XMS := $(get-product-property dalvik.vm.image-dex2oat-Xms)
-DEX2OAT_IMAGE_XMX := $(get-product-property dalvik.vm.image-dex2oat-Xmx)
-DEX2OAT_XMS := $(get-product-property dalvik.vm.dex2oat-Xms)
-DEX2OAT_XMX := $(get-product-property dalvik.vm.dex2oat-Xmx)
+DEX2OAT_IMAGE_XMS := $(call get-product-default-property,dalvik.vm.image-dex2oat-Xms)
+DEX2OAT_IMAGE_XMX := $(call get-product-default-property,dalvik.vm.image-dex2oat-Xmx)
+DEX2OAT_XMS := $(call get-product-default-property,dalvik.vm.dex2oat-Xms)
+DEX2OAT_XMX := $(call get-product-default-property,dalvik.vm.dex2oat-Xmx)
 
 ########################################################################
 # The full system boot classpath
@@ -77,7 +77,7 @@
 $(hide) rm -f $(2)
 $(hide) mkdir -p $(dir $(2))
 $(hide) $(DEX2OATD) \
-	--runtime-arg $(DEX2OAT_XMS) --runtime-arg $(DEX2OAT_XMX) \
+	--runtime-arg -Xms$(DEX2OAT_XMS) --runtime-arg -Xmx$(DEX2OAT_XMX) \
 	--boot-image=$(PRIVATE_DEX_PREOPT_IMAGE_LOCATION) \
 	--dex-file=$(1) \
 	--dex-location=$(PRIVATE_DEX_LOCATION) \
diff --git a/core/dex_preopt_libart_boot.mk b/core/dex_preopt_libart_boot.mk
index e48e3f9..7eefc0b 100644
--- a/core/dex_preopt_libart_boot.mk
+++ b/core/dex_preopt_libart_boot.mk
@@ -43,7 +43,7 @@
 	@echo "target dex2oat: $@ ($?)"
 	@mkdir -p $(dir $@)
 	@mkdir -p $(dir $($(PRIVATE_2ND_ARCH_VAR_PREFIX)LIBART_TARGET_BOOT_OAT_UNSTRIPPED))
-	$(hide) $(DEX2OATD) --runtime-arg $(DEX2OAT_IMAGE_XMS) --runtime-arg $(DEX2OAT_IMAGE_XMX) \
+	$(hide) $(DEX2OATD) --runtime-arg -Xms$(DEX2OAT_IMAGE_XMS) --runtime-arg -Xmx$(DEX2OAT_IMAGE_XMX) \
 		--image-classes=$(PRELOADED_CLASSES) \
 		$(addprefix --dex-file=,$(LIBART_TARGET_BOOT_DEX_FILES)) \
 		$(addprefix --dex-location=,$(LIBART_TARGET_BOOT_DEX_LOCATIONS)) \