diff --git a/Android.mk b/Android.mk
index 6eb1cbcd..9ad3507d 100755
--- a/Android.mk
+++ b/Android.mk
@@ -34,6 +34,10 @@ ifneq (,$(filter $(PLATFORM_SDK_VERSION), 21 22))
     BOARD_SEPOLICY_UNION += twrp.te
 endif
 
+ifeq ($(CM_PLATFORM_SDK_VERSION),)
+    CM_PLATFORM_SDK_VERSION := 0
+endif
+
 include $(CLEAR_VARS)
 
 TWRES_PATH := /twres/