diff --git a/clang/lib/Serialization/ASTWriterDecl.cpp b/clang/lib/Serialization/ASTWriterDecl.cpp
index f08f140..29b948d 100644
--- a/clang/lib/Serialization/ASTWriterDecl.cpp
+++ b/clang/lib/Serialization/ASTWriterDecl.cpp
@@ -1380,10 +1380,11 @@
   VisitTypeDecl(D);
 
   Record.push_back(D->wasDeclaredWithTypename());
-  Record.push_back(D->defaultArgumentWasInherited());
-  if (D->defaultArgumentWasInherited())
-    Writer.AddDeclRef(D->getDefaultArgStorage().getInheritedFrom(), Record);
-  else
+
+  bool OwnsDefaultArg = D->hasDefaultArgument() &&
+                        !D->defaultArgumentWasInherited();
+  Record.push_back(OwnsDefaultArg);
+  if (OwnsDefaultArg)
     Writer.AddTypeSourceInfo(D->getDefaultArgumentInfo(), Record);
 
   Code = serialization::DECL_TEMPLATE_TYPE_PARM;
@@ -1411,10 +1412,10 @@
   } else {
     // Rest of NonTypeTemplateParmDecl.
     Record.push_back(D->isParameterPack());
-    Record.push_back(D->defaultArgumentWasInherited());
-    if (D->defaultArgumentWasInherited())
-      Writer.AddDeclRef(D->getDefaultArgStorage().getInheritedFrom(), Record);
-    else
+    bool OwnsDefaultArg = D->hasDefaultArgument() &&
+                          !D->defaultArgumentWasInherited();
+    Record.push_back(OwnsDefaultArg);
+    if (OwnsDefaultArg)
       Writer.AddStmt(D->getDefaultArgument());
     Code = serialization::DECL_NON_TYPE_TEMPLATE_PARM;
   }
@@ -1441,10 +1442,10 @@
   } else {
     // Rest of TemplateTemplateParmDecl.
     Record.push_back(D->isParameterPack());
-    Record.push_back(D->defaultArgumentWasInherited());
-    if (D->defaultArgumentWasInherited())
-      Writer.AddDeclRef(D->getDefaultArgStorage().getInheritedFrom(), Record);
-    else
+    bool OwnsDefaultArg = D->hasDefaultArgument() &&
+                          !D->defaultArgumentWasInherited();
+    Record.push_back(OwnsDefaultArg);
+    if (OwnsDefaultArg)
       Writer.AddTemplateArgumentLoc(D->getDefaultArgument(), Record);
     Code = serialization::DECL_TEMPLATE_TEMPLATE_PARM;
   }