diff --git a/lib/Serialization/ASTWriterDecl.cpp b/lib/Serialization/ASTWriterDecl.cpp
index a5c4398..95b0c3c 100644
--- a/lib/Serialization/ASTWriterDecl.cpp
+++ b/lib/Serialization/ASTWriterDecl.cpp
@@ -577,6 +577,7 @@
 void ASTDeclWriter::VisitParmVarDecl(ParmVarDecl *D) {
   VisitVarDecl(D);
   Record.push_back(D->getObjCDeclQualifier()); // FIXME: stable encoding
+  Record.push_back(D->isKNRPromoted());
   Record.push_back(D->hasInheritedDefaultArg());
   Record.push_back(D->hasUninstantiatedDefaultArg());
   if (D->hasUninstantiatedDefaultArg())
@@ -595,6 +596,7 @@
       D->getStorageClass() == 0 &&
       !D->hasCXXDirectInitializer() && // Can params have this ever?
       D->getObjCDeclQualifier() == 0 &&
+      !D->isKNRPromoted() &&
       !D->hasInheritedDefaultArg() &&
       D->getInit() == 0 &&
       !D->hasUninstantiatedDefaultArg())  // No default expr.
@@ -1147,6 +1149,7 @@
   Abv->Add(BitCodeAbbrevOp(0));                   // HasMemberSpecializationInfo
   // ParmVarDecl
   Abv->Add(BitCodeAbbrevOp(0));                       // ObjCDeclQualifier
+  Abv->Add(BitCodeAbbrevOp(0));                       // KNRPromoted
   Abv->Add(BitCodeAbbrevOp(0));                       // HasInheritedDefaultArg
   Abv->Add(BitCodeAbbrevOp(0));                   // HasUninstantiatedDefaultArg