diff --git a/pybis/src/python/pybis/pybis.py b/pybis/src/python/pybis/pybis.py
index a78deb31a389256b4eade66b2016e07e39cc49c4..844f710fe33d40ef3507bdcbc23789f65efa1b7d 100644
--- a/pybis/src/python/pybis/pybis.py
+++ b/pybis/src/python/pybis/pybis.py
@@ -766,7 +766,6 @@ class Openbis:
         entity = entity.upper()
         entity2enum = {
             "DATASET" : "DATA_SET",
-            "DATASET" : "DATASET",
             "OBJECT"  : "SAMPLE",
             "SAMPLE"  : "SAMPLE",
             "EXPERIMENT" : "EXPERIMENT",