diff --git a/pandas/core/computation/ops.py b/pandas/core/computation/ops.py
index 3a556b57ea5a5..cd5096f405770 100644
--- a/pandas/core/computation/ops.py
+++ b/pandas/core/computation/ops.py
@@ -555,6 +555,7 @@ class UnaryOp(Op):
     def __init__(self, op: str, operand) -> None:
         super().__init__(op, (operand,))
         self.operand = operand
+        self.value = operand
 
         try:
             self.func = _unary_ops_dict[op]