diff --git a/client/dictionaries/mfc_default_keys.dic b/client/dictionaries/mfc_default_keys.dic
index bc062d13bc..4879859d6b 100644
--- a/client/dictionaries/mfc_default_keys.dic
+++ b/client/dictionaries/mfc_default_keys.dic
@@ -2678,3 +2678,17 @@ D68D7EBB9551
 #
 # Payment cards used by Eurest on certain campuses
 7E2BC58168EB
+#
+# Shower cards provided by Seijsener
+291A65CBEA7B
+344A359BBAD9
+476572726974
+4D696368656C
+4F3748E6C826
+69D40AF8B353
+72DEA10F21DF
+74845AA8E3F1
+8C3C43EDCC55
+ACD30DFFB434
+D1A27C8EC5DF
+F14D329CBDBE