diff --git a/taskflow/states.py b/taskflow/states.py
index 7fea38b0..883bf622 100644
--- a/taskflow/states.py
+++ b/taskflow/states.py
@@ -36,7 +36,7 @@ RESUMING = 'RESUMING'
 FAILURE = FAILURE
 PENDING = PENDING
 REVERTED = REVERTED
-REVERTING = 'REVERTING'
+REVERTING = REVERTING
 SUCCESS = SUCCESS
 RUNNING = RUNNING
 RETRYING = 'RETRYING'