diff --git a/core/force_aapt2.mk b/core/force_aapt2.mk
index 816138a..25b45e4 100644
--- a/core/force_aapt2.mk
+++ b/core/force_aapt2.mk
@@ -39,8 +39,8 @@
 endif
 
 # AAPT2 is pickier about missing resources.  Support library may have references to resources
-# added in current, so always treat LOCAL_SDK_VERSION as LOCAL_SDK_RES_VERSION := current.
-ifdef LOCAL_SDK_VERSION
+# added in current, so always treat LOCAL_SDK_VERSION := <number> as LOCAL_SDK_RES_VERSION := current.
+ifneq (,$(filter-out current system_current test_current core_current,$(LOCAL_SDK_VERSION)))
   LOCAL_SDK_RES_VERSION := current
 endif