diff --git a/src/twomartens/masterthesis/definitions.py b/src/twomartens/masterthesis/definitions.py
index 83a13d3..c5a6b01 100644
--- a/src/twomartens/masterthesis/definitions.py
+++ b/src/twomartens/masterthesis/definitions.py
@@ -23,7 +23,6 @@ Attributes:
 """
 
 COCO_TO_WNID = {
-    1:  [],
     2:  ['04466871'],
     25: ['02773838'],
     27: ['02773838'],