diff --git a/core/config.mk b/core/config.mk
index e615159da..930e82bcf 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -535,6 +535,7 @@ ACP := $(BUILD_OUT_EXECUTABLES)/acp$(BUILD_EXECUTABLE_SUFFIX)
 
 # dx is java behind a shell script; no .exe necessary.
 DX := $(HOST_OUT_EXECUTABLES)/dx
+MAINDEXCLASSES := $(HOST_OUT_EXECUTABLES)/mainDexClasses
 ZIPALIGN := $(HOST_OUT_EXECUTABLES)/zipalign$(HOST_EXECUTABLE_SUFFIX)
 ifndef TARGET_BUILD_APPS
 ZIPTIME := $(HOST_OUT_EXECUTABLES)/ziptime$(HOST_EXECUTABLE_SUFFIX)