diff --git a/core/main.mk b/core/main.mk
index c2287bb..5204132 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -150,9 +150,6 @@
 # Bring in standard build system definitions.
 include $(BUILD_SYSTEM)/definitions.mk
 
-# Bring in dex_preopt.mk
-include $(BUILD_SYSTEM)/dex_preopt.mk
-
 ifneq ($(filter user userdebug eng,$(MAKECMDGOALS)),)
 $(info ***************************************************************)
 $(info ***************************************************************)
@@ -473,6 +470,12 @@
 # Typical build; include any Android.mk files we can find.
 #
 
+# Bring in dex_preopt.mk
+# This creates some modules so it needs to be included after
+# should-install-to-system is defined (in order for base_rules.mk to function
+# properly), but before readonly-final-product-vars is called.
+include $(BUILD_SYSTEM)/dex_preopt.mk
+
 # Strip and readonly a few more variables so they won't be modified.
 $(readonly-final-product-vars)
 ADDITIONAL_SYSTEM_PROPERTIES := $(strip $(ADDITIONAL_SYSTEM_PROPERTIES))