diff --git a/python3/vimspector/variables.py b/python3/vimspector/variables.py
index ffd641d..d82090a 100644
--- a/python3/vimspector/variables.py
+++ b/python3/vimspector/variables.py
@@ -106,6 +106,7 @@ class Watch:
   """Holds a user watch expression (DAP request) and the result (WatchResult)"""
   def __init__( self, expression: dict ):
     self.result: WatchResult
+    self.line = None
 
     self.expression = expression
     self.result = None