1 files changed, 3 insertions, 2 deletions
diff --git a/clang/lib/CodeGen/CodeGenModule.h b/clang/lib/CodeGen/CodeGenModule.h
index 8b142933a7d..ff9866a3696 100644
--- a/clang/lib/CodeGen/CodeGenModule.h
+++ b/clang/lib/CodeGen/CodeGenModule.h
@@ -688,8 +688,9 @@ public:
   /// getTBAAInfoForSubobject - Get TBAA information for an access with a given
   /// base lvalue.
   TBAAAccessInfo getTBAAInfoForSubobject(LValue Base, QualType AccessType) {
-    if (Base.getTBAAInfo().isMayAlias())
-      return TBAAAccessInfo::getMayAliasInfo();
+    TBAAAccessInfo TBAAInfo = Base.getTBAAInfo();
+    if (TBAAInfo.isMayAlias() || TBAAInfo.isUnionMember())
+      return TBAAInfo;
     return getTBAAAccessInfo(AccessType);
   }