diff --git a/gitlab/v4/objects/merge_request_approvals.py b/gitlab/v4/objects/merge_request_approvals.py
index 6ca324ecf..3d2082b91 100644
--- a/gitlab/v4/objects/merge_request_approvals.py
+++ b/gitlab/v4/objects/merge_request_approvals.py
@@ -90,7 +90,13 @@ class ProjectApprovalRuleManager(
     _from_parent_attrs = {"project_id": "id"}
     _create_attrs = RequiredOptional(
         required=("name", "approvals_required"),
-        optional=("user_ids", "group_ids", "protected_branch_ids", "usernames"),
+        optional=(
+            "user_ids",
+            "group_ids",
+            "protected_branch_ids",
+            "usernames",
+            "applies_to_all_protected_branches",
+        ),
     )