diff --git a/test/Model/TypesSpec.hs b/test/Model/TypesSpec.hs
index 53d8ab8dc..486b9c03e 100644
--- a/test/Model/TypesSpec.hs
+++ b/test/Model/TypesSpec.hs
@@ -298,6 +298,7 @@ instance Arbitrary CsvFormatOptions where
         <*> arbitrary
         <*> arbitrary
         <*> elements ["UTF8", "CP1252"]
+        <*> True
     , pure CsvXlsxFormatOptions
     ]
     where