diff --git a/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
index fe63b7043c50..cb4310836dd7 100644
--- a/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
@@ -1536,7 +1536,7 @@ TypeIndex CodeViewDebug::lowerTypeUnion(const DICompositeType *Ty) {
 }
 
 TypeIndex CodeViewDebug::lowerCompleteTypeUnion(const DICompositeType *Ty) {
-  ClassOptions CO = getCommonClassOptions(Ty);
+  ClassOptions CO = ClassOptions::Sealed | getCommonClassOptions(Ty);
   TypeIndex FieldTI;
   unsigned FieldCount;
   bool ContainsNestedClass;
diff --git a/llvm/test/DebugInfo/COFF/types-data-members.ll b/llvm/test/DebugInfo/COFF/types-data-members.ll
index 70a509714b69..759a5e546446 100644
--- a/llvm/test/DebugInfo/COFF/types-data-members.ll
+++ b/llvm/test/DebugInfo/COFF/types-data-members.ll
@@ -161,8 +161,9 @@
 ; CHECK:   Union (0x100B) {
 ; CHECK:     TypeLeafKind: LF_UNION (0x1506)
 ; CHECK:     MemberCount: 2
-; CHECK:     Properties [ (0x200)
+; CHECK:     Properties [ (0x600)
 ; CHECK:       HasUniqueName (0x200)
+; CHECK:       Sealed (0x400)
 ; CHECK:     ]
 ; CHECK:     FieldList: <field list> (0x100A)
 ; CHECK:     SizeOf: 4