diff --git a/src/MDConcCurrencies.php b/src/MDConcCurrencies.php
index def1916..87a7a29 100644
--- a/src/MDConcCurrencies.php
+++ b/src/MDConcCurrencies.php
@@ -53,6 +53,10 @@ final class MDConcCurrencies implements MDImporterConcordanceListInterface {
         "FF" => "fr-FF",
         "FRF" => "fr-FF",
 
+        // Dutch Guilders
+        'fl' => 'nl-Gulden',
+        'FL' => 'nl-Gulden',
+
         // Forint
         "Forint" => "hu-Ft",
         "FT" => "hu-Ft",