diff --git a/lib/tc211/termbase/terminology_sheet.rb b/lib/tc211/termbase/terminology_sheet.rb
index 2c252fe..521b1b5 100644
--- a/lib/tc211/termbase/terminology_sheet.rb
+++ b/lib/tc211/termbase/terminology_sheet.rb
@@ -29,7 +29,7 @@ def set_language_code(code)
 
       @language_code = case code
       when "dut/nld"
-        "dut"
+        "nld"
       when "chi"
         "zho"
       when "ger"