diff --git a/Android.mk b/Android.mk
index 8d73e8f..588d80e 100755
--- a/Android.mk
+++ b/Android.mk
@@ -423,6 +423,9 @@
 ifneq ($(TARGET_OTA_ASSERT_DEVICE),)
     LOCAL_CFLAGS += -DTARGET_OTA_ASSERT_DEVICE='"$(TARGET_OTA_ASSERT_DEVICE)"'
 endif
+ifneq ($(TW_BACKUP_EXCLUSIONS),)
+	LOCAL_CFLAGS += -DTW_BACKUP_EXCLUSIONS='"$(TW_BACKUP_EXCLUSIONS)"'
+endif
 
 LOCAL_C_INCLUDES += system/vold \