diff --git a/clang/lib/AST/Decl.cpp b/clang/lib/AST/Decl.cpp
--- a/clang/lib/AST/Decl.cpp
+++ b/clang/lib/AST/Decl.cpp
@@ -4769,7 +4769,8 @@
 RecordDecl::field_iterator RecordDecl::field_begin() const {
   if (hasExternalLexicalStorage() && !hasLoadedFieldsFromExternalStorage())
     LoadFieldsFromExternalStorage();
-
+  if (RecordDecl *D = getDefinition(); D && D != this)
+    return D->field_begin();
   return field_iterator(decl_iterator(FirstDecl));
 }