2 files changed, 11 insertions, 0 deletions
diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 2e8e8ca67b1..6f8856cd8de 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -4730,6 +4730,13 @@ ASTReader::ReadNestedNameSpecifier(const RecordData &Record, unsigned &Idx) {
       break;
     }
 
+    case NestedNameSpecifier::NamespaceAlias: {
+      NamespaceAliasDecl *Alias
+        = cast<NamespaceAliasDecl>(GetDecl(Record[Idx++]));
+      NNS = NestedNameSpecifier::Create(*Context, Prev, Alias);
+      break;
+    }
+
     case NestedNameSpecifier::TypeSpec:
     case NestedNameSpecifier::TypeSpecWithTemplate: {
       const Type *T = GetType(Record[Idx++]).getTypePtrOrNull();
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index b1edf95b9f9..42ca293932b 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -3470,6 +3470,10 @@ void ASTWriter::AddNestedNameSpecifier(NestedNameSpecifier *NNS,
       AddDeclRef(NNS->getAsNamespace(), Record);
       break;
 
+    case NestedNameSpecifier::NamespaceAlias:
+      AddDeclRef(NNS->getAsNamespaceAlias(), Record);
+      break;
+
     case NestedNameSpecifier::TypeSpec:
     case NestedNameSpecifier::TypeSpecWithTemplate:
       AddTypeRef(QualType(NNS->getAsType(), 0), Record);