diff --git a/lib/Serialization/ASTCommon.cpp b/lib/Serialization/ASTCommon.cpp
index 445e750..1103dc0 100644
--- a/lib/Serialization/ASTCommon.cpp
+++ b/lib/Serialization/ASTCommon.cpp
@@ -54,6 +54,8 @@
   case BuiltinType::BoundMember:ID = PREDEF_TYPE_BOUND_MEMBER;  break;
   case BuiltinType::Dependent:  ID = PREDEF_TYPE_DEPENDENT_ID;  break;
   case BuiltinType::UnknownAny: ID = PREDEF_TYPE_UNKNOWN_ANY;   break;
+  case BuiltinType::ARCUnbridgedCast:
+                                ID = PREDEF_TYPE_ARC_UNBRIDGED_CAST; break;
   case BuiltinType::ObjCId:     ID = PREDEF_TYPE_OBJC_ID;       break;
   case BuiltinType::ObjCClass:  ID = PREDEF_TYPE_OBJC_CLASS;    break;
   case BuiltinType::ObjCSel:    ID = PREDEF_TYPE_OBJC_SEL;      break;
diff --git a/lib/Serialization/ASTReader.cpp b/lib/Serialization/ASTReader.cpp
index dc7829f..3a8e503 100644
--- a/lib/Serialization/ASTReader.cpp
+++ b/lib/Serialization/ASTReader.cpp
@@ -3839,6 +3839,11 @@
     case PREDEF_TYPE_AUTO_RREF_DEDUCT: 
       T = Context.getAutoRRefDeductType(); 
       break;
+
+    case PREDEF_TYPE_ARC_UNBRIDGED_CAST:
+      T = Context.ARCUnbridgedCastTy;
+      break;
+
     }
 
     assert(!T.isNull() && "Unknown predefined type");