diff --git a/pybis/src/python/pybis/definitions.py b/pybis/src/python/pybis/definitions.py
index ca0a43e785563549577e91d6a07968c7ea574d20..3cd8f77a0330c30a1df9ff06a39998ba654ce6cf 100644
--- a/pybis/src/python/pybis/definitions.py
+++ b/pybis/src/python/pybis/definitions.py
@@ -197,7 +197,7 @@ def openbis_definitions(entity):
             "multi": "parents children containers components".split(),
             "identifier": "dataSetId",
         },
-        "Material": {
+        "material": {
             "attrs_new": "code description type creation tags".split(),
             "attrs_up": "description type creation tags".split(),
             "attrs": "code description type creation registrator registrationDate modifier modificationDate tags".split(),
@@ -223,7 +223,7 @@ def openbis_definitions(entity):
             "delete": { "@type": "as.dto.vocabulary.delete.VocabularyDeletionOptions"},
             "fetch":  { "@type": "as.dto.vocabulary.fetchoptions.VocabularyFetchOptions"},
         },
-        "VocabularyTerm": {
+        "vocabularyTerm": {
             "attrs_new": "code vocabularyCode label description official ordinal".split(),
             "attrs_up": "label description official previousTermId".split(),
             "attrs": "code vocabularyCode label description official ordinal registrator registrationDate modifier modificationDate".split(),
diff --git a/pybis/src/python/pybis/vocabulary.py b/pybis/src/python/pybis/vocabulary.py
index 90133dd684fdd55024d8e05c726aa4f1e4343c9b..3fc44a41dbfbe1030e5bf60ef5dc7f8168a7fb64 100644
--- a/pybis/src/python/pybis/vocabulary.py
+++ b/pybis/src/python/pybis/vocabulary.py
@@ -127,7 +127,7 @@ class VocabularyTerm(OpenBisObject):
 
     def __init__(self, openbis_obj, data=None, **kwargs):
         self.__dict__['openbis'] = openbis_obj
-        self.__dict__['a'] = AttrHolder(openbis_obj, 'VocabularyTerm')
+        self.__dict__['a'] = AttrHolder(openbis_obj, 'vocabularyTerm')
 
         if data is not None:
             self._set_data(data)