diff --git a/core/java.mk b/core/java.mk
index 9a5404e..95ec8f5 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -252,6 +252,11 @@
 
 java_alternative_checked_module :=
 
+#######################################
+# defines built_odex along with rule to install odex
+include $(BUILD_SYSTEM)/dex_preopt_odex_install.mk
+#######################################
+
 # Make sure there's something to build.
 ifdef full_classes_jar
 ifndef need_compile_java