diff --git a/fennel/CHANGELOG.md b/fennel/CHANGELOG.md
index 143f2013..b7e3f7e3 100644
--- a/fennel/CHANGELOG.md
+++ b/fennel/CHANGELOG.md
@@ -1,5 +1,8 @@
 # Changelog
 
+## [1.5.25] - 2024-09-24
+- Fix unary operator expressions
+
 ## [1.5.24] - 2024-09-18
 - Add support for aggregation on optional dtype columns
 
diff --git a/fennel/expr/test_expr.py b/fennel/expr/test_expr.py
index 478bd0ae..be2d3555 100644
--- a/fennel/expr/test_expr.py
+++ b/fennel/expr/test_expr.py
@@ -769,12 +769,12 @@ def test_list():
         ),
         # List contains
         ExprTestCase(
-            expr=(col("a").list.contains(3)),
+            expr=(~col("a").list.contains(3)),
             df=pd.DataFrame({"a": [[1, 2, 3], [4, 5, 6], [7, 8, 9]]}),
             schema={"a": List[int]},
-            display="CONTAINS(col('a'), 3)",
+            display="~(CONTAINS(col('a'), 3))",
             refs={"a"},
-            eval_result=[True, False, False],
+            eval_result=[False, True, True],
             expected_dtype=bool,
             proto_json=None,
         ),
diff --git a/fennel/expr/visitor.py b/fennel/expr/visitor.py
index 6e7cf4c1..8affab86 100644
--- a/fennel/expr/visitor.py
+++ b/fennel/expr/visitor.py
@@ -179,7 +179,7 @@ def visitRef(self, obj):
         return str(obj)
 
     def visitUnary(self, obj):
-        return "%s(%s)" % (obj.op, self.visit(obj.expr))
+        return "%s(%s)" % (obj.op, self.visit(obj.operand))
 
     def visitBinary(self, obj):
         return "(%s %s %s)" % (
diff --git a/pyproject.toml b/pyproject.toml
index 9377b989..74264934 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "fennel-ai"
-version = "1.5.24"
+version = "1.5.25"
 description = "The modern realtime feature engineering platform"
 authors = ["Fennel AI <developers@fennel.ai>"]
 packages = [{ include = "fennel" }]