diff --git a/src/MDConcLanguages.php b/src/MDConcLanguages.php
index 357b9fb..88c6698 100644
--- a/src/MDConcLanguages.php
+++ b/src/MDConcLanguages.php
@@ -21,6 +21,7 @@ final class MDConcLanguages implements MDImporterConcordanceListInterface {
         'EN' => 'en',
         'ENG' => 'en',
         'eng; ger' => 'en',
+        'en-GB' => 'en',
 
         # German
         'Deutsch' => 'de',