diff --git a/src/serializer.cc b/src/serializer.cc
index 48cae64d..cd374c35 100644
--- a/src/serializer.cc
+++ b/src/serializer.cc
@@ -231,8 +231,8 @@ void Reflect(TVisitor& visitor, IndexFile& value) {
     REFLECT_MEMBER(last_modification_time);
     REFLECT_MEMBER(import_file);
     REFLECT_MEMBER(args);
+    REFLECT_MEMBER(diagnostics);
   }
-  REFLECT_MEMBER(diagnostics);
   REFLECT_MEMBER(dependencies);
   REFLECT_MEMBER(types);
   REFLECT_MEMBER(funcs);