diff --git a/core/android_soong_config_vars.mk b/core/android_soong_config_vars.mk
index ee12c8c..883f92d 100644
--- a/core/android_soong_config_vars.mk
+++ b/core/android_soong_config_vars.mk
@@ -27,3 +27,10 @@
 # Add variables to the namespace below:
 
 $(call add_soong_config_var,ANDROID,TARGET_ENABLE_MEDIADRM_64)
+
+# TODO(b/172480615): Remove when platform uses ART Module prebuilts by default.
+ifeq (,$(filter art_module,$(SOONG_CONFIG_NAMESPACES)))
+  $(call add_soong_config_namespace,art_module)
+  SOONG_CONFIG_art_module += source_build
+endif
+SOONG_CONFIG_art_module_source_build ?= true