diff --git a/internal/core/src/segcore/InsertRecord.h b/internal/core/src/segcore/InsertRecord.h
index c59e4a685e..d9c8004506 100644
--- a/internal/core/src/segcore/InsertRecord.h
+++ b/internal/core/src/segcore/InsertRecord.h
@@ -27,8 +27,7 @@ struct InsertRecord {
     explicit InsertRecord(const Schema& schema, int64_t size_per_chunk);
 
     // get field data without knowing the type
-    // return VectorBase type
-    auto
+    VectorBase*
     get_field_data_base(FieldOffset field_offset) const {
         auto ptr = field_datas_[field_offset.get()].get();
         return ptr;
@@ -36,7 +35,7 @@ struct InsertRecord {
 
     // get field data in given type, const version
     template <typename Type>
-    auto
+    const ConcurrentVector<Type>*
     get_field_data(FieldOffset field_offset) const {
         auto base_ptr = get_field_data_base(field_offset);
         auto ptr = dynamic_cast<const ConcurrentVector<Type>*>(base_ptr);
@@ -44,9 +43,9 @@ struct InsertRecord {
         return ptr;
     }
 
-    // get field data in given type, nonconst version
+    // get field data in given type, non-const version
     template <typename Type>
-    auto
+    ConcurrentVector<Type>*
     get_field_data(FieldOffset field_offset) {
         auto base_ptr = get_field_data_base(field_offset);
         auto ptr = dynamic_cast<ConcurrentVector<Type>*>(base_ptr);