diff --git a/src/MDConcEventTypes.php b/src/MDConcEventTypes.php
index ff16077..8267feb 100644
--- a/src/MDConcEventTypes.php
+++ b/src/MDConcEventTypes.php
@@ -33,7 +33,6 @@ final class MDConcEventTypes implements MDImporterConcordanceListInterface {
         'Ereignis' => 1,
         'http://terminology.lido-schema.org/lido00003' => 1,
         'Herstellung des Abzugs/der Abformung' => 1,
-        'Herstellung des Abzugs/der Abformung' => 1,
 
         // 2: Was found
         'Auffinden' => 2,