diff --git a/src/MDConcCurrencies.php b/src/MDConcCurrencies.php
index 9567174..233c82d 100644
--- a/src/MDConcCurrencies.php
+++ b/src/MDConcCurrencies.php
@@ -32,6 +32,7 @@ final class MDConcCurrencies {
         "Deutsche Mark" => "de-DM",
         "RM" => "de-RM",
         "Reichsmark" => "de-RM",
+        "Reichsmark (Deutsches Reich)" => "de-RM",
         "EUR" => "eu-EUR",
         "Euro" => "eu-EUR",
         "EURO" => "eu-EUR",