diff --git a/modelscope/utils/constant.py b/modelscope/utils/constant.py
index c26a9e24..3eb2890a 100644
--- a/modelscope/utils/constant.py
+++ b/modelscope/utils/constant.py
@@ -43,8 +43,7 @@ class Tasks(object):
     text_generation = 'text-generation'
     table_question_answering = 'table-question-answering'
     feature_extraction = 'feature-extraction'
-    sentence_similarity = 'sentence-similarity'
-    fill_mask = 'fill-mask '
+    fill_mask = 'fill-mask'
     summarization = 'summarization'
     question_answering = 'question-answering'