diff --git a/src/api/Controllers/ImportController.cs b/src/api/Controllers/ImportController.cs
index 64d0e9ec3..f82021fe0 100644
--- a/src/api/Controllers/ImportController.cs
+++ b/src/api/Controllers/ImportController.cs
@@ -355,8 +355,6 @@ private void AddValidationErrorToModelState(int boreholeIndex, string errorMessa
 
     private sealed class CsvImportBoreholeMap : ClassMap<BoreholeImport>
     {
-        private readonly List<Codelist> codelists;
-
         public CsvImportBoreholeMap(List<Codelist> codelists)
         {
             AutoMap(CsvConfigHelper.CsvReadConfig);