diff --git a/lib/wp/defs.h b/lib/wp/defs.h
index bb49b974eb106557fdc530e3d7320c47d0a9a2e1..759e717698006f0ef54698180802b45a46fa71b5 100644
--- a/lib/wp/defs.h
+++ b/lib/wp/defs.h
@@ -27,4 +27,12 @@
 # endif
 #endif
 
+#ifndef WP_PRIVATE_API
+# ifdef BUILDING_WP
+#  define WP_PRIVATE_API
+# else
+#  define WP_PRIVATE_API __attribute__ ((deprecated ("Private API")))
+# endif
+#endif
+
 #endif