diff --git a/core/dex_preopt.mk b/core/dex_preopt.mk
index 88ec47f..62c3ba3 100644
--- a/core/dex_preopt.mk
+++ b/core/dex_preopt.mk
@@ -93,6 +93,7 @@
 
 $(call dist-for-goals, droidcore, $(boot_zip))
 
+ifneq (,$(filter true,$(ART_MODULE_BUILD_FROM_SOURCE) $(MODULE_BUILD_FROM_SOURCE)))
 # Build the system_server.zip which contains the Apex system server jars and standalone system server jars
 system_server_zip := $(PRODUCT_OUT)/system_server.zip
 apex_system_server_jars := \
@@ -122,5 +123,6 @@
 
 $(call dist-for-goals, droidcore, $(system_server_zip))
 
+endif  #ART_MODULE_BUILD_FROM_SOURCE || MODULE_BUILD_FROM_SOURCE
 endif  #PRODUCT_USES_DEFAULT_ART_CONFIG
 endif  #WITH_DEXPREOPT