diff --git a/lib/Frontend/PCHReaderDecl.cpp b/lib/Frontend/PCHReaderDecl.cpp
index a3f5eac..70aa0dd 100644
--- a/lib/Frontend/PCHReaderDecl.cpp
+++ b/lib/Frontend/PCHReaderDecl.cpp
@@ -411,6 +411,7 @@
 void PCHDeclReader::VisitParmVarDecl(ParmVarDecl *PD) {
   VisitVarDecl(PD);
   PD->setObjCDeclQualifier((Decl::ObjCDeclQualifier)Record[Idx++]);
+  PD->setHasInheritedDefaultArg(Record[Idx++]);
 }
 
 void PCHDeclReader::VisitFileScopeAsmDecl(FileScopeAsmDecl *AD) {
diff --git a/lib/Frontend/PCHWriterDecl.cpp b/lib/Frontend/PCHWriterDecl.cpp
index 0774797..d40658c 100644
--- a/lib/Frontend/PCHWriterDecl.cpp
+++ b/lib/Frontend/PCHWriterDecl.cpp
@@ -398,6 +398,7 @@
 void PCHDeclWriter::VisitParmVarDecl(ParmVarDecl *D) {
   VisitVarDecl(D);
   Record.push_back(D->getObjCDeclQualifier()); // FIXME: stable encoding
+  Record.push_back(D->hasInheritedDefaultArg());
   Code = pch::DECL_PARM_VAR;
 
 
@@ -412,7 +413,8 @@
       D->getPCHLevel() == 0 &&
       D->getStorageClass() == 0 &&
       !D->hasCXXDirectInitializer() && // Can params have this ever?
-      D->getObjCDeclQualifier() == 0)
+      D->getObjCDeclQualifier() == 0 &&
+      !D->hasInheritedDefaultArg())
     AbbrevToUse = Writer.getParmVarDeclAbbrev();
 
   // Check things we know are true of *every* PARM_VAR_DECL, which is more than
@@ -496,6 +498,7 @@
   Abv->Add(BitCodeAbbrevOp(0));                       // HasInit
   // ParmVarDecl
   Abv->Add(BitCodeAbbrevOp(0));                       // ObjCDeclQualifier
+  Abv->Add(BitCodeAbbrevOp(0));                       // HasInheritedDefaultArg
 
   ParmVarDeclAbbrev = Stream.EmitAbbrev(Abv);
 }