diff --git a/lib/Basic/IdentifierTable.cpp b/lib/Basic/IdentifierTable.cpp
index 38f09a08..78f8a7c 100644
--- a/lib/Basic/IdentifierTable.cpp
+++ b/lib/Basic/IdentifierTable.cpp
@@ -222,6 +222,8 @@
 
   CASE(16, '_', 'i', __include_macros);
   CASE(16, '_', 'e', __export_macro__);
+      
+  CASE(17, '_', 'p', __private_macro__);
 #undef CASE
 #undef HASH
   }