diff --git a/third_party/2.7/sqlalchemy/sql/operators.pyi b/third_party/2.7/sqlalchemy/sql/operators.pyi
index 1b33d003a..5ae39cd50 100644
--- a/third_party/2.7/sqlalchemy/sql/operators.pyi
+++ b/third_party/2.7/sqlalchemy/sql/operators.pyi
@@ -27,7 +27,7 @@ class ColumnOperators(Operators):
     def nullsfirst(self): ...
     def nullslast(self): ...
     def collate(self, collation): ...
-    def between(self, cleft, cright, symmetric: bool): ...
+    def between(self, cleft, cright, symmetric: bool = ...): ...
     def distinct(self): ...
 
     def __lt__(self, other): ...