diff --git a/alembic/operations/base.py b/alembic/operations/base.py
index bd1b170d..649e7f2b 100644
--- a/alembic/operations/base.py
+++ b/alembic/operations/base.py
@@ -1721,7 +1721,7 @@ def create_exclude_constraint(
 
         def create_foreign_key(
             self,
-            constraint_name: str,
+            constraint_name: Optional[str],
             referent_table: str,
             local_cols: List[str],
             remote_cols: List[str],
diff --git a/alembic/operations/ops.py b/alembic/operations/ops.py
index 0282d571..3a9c033c 100644
--- a/alembic/operations/ops.py
+++ b/alembic/operations/ops.py
@@ -681,7 +681,7 @@ def create_foreign_key(
     def batch_create_foreign_key(
         cls,
         operations: BatchOperations,
-        constraint_name: str,
+        constraint_name: Optional[str],
         referent_table: str,
         local_cols: List[str],
         remote_cols: List[str],