diff --git a/changelog.d/16874.feature b/changelog.d/16874.feature
index 3f8ee7095c..d428b0ae45 100644
--- a/changelog.d/16874.feature
+++ b/changelog.d/16874.feature
@@ -1 +1 @@
-Handling of the query parameter `deactivated` in [List Accounts (V3)](https://element-hq.github.io/synapse/v1.99/admin_api/user_admin_api.html#list-accounts) [admin API](https://element-hq.github.io/synapse/v1.99/usage/administration/admin_api/index.html) adjusted, to filter deactivated users in user queries.
\ No newline at end of file
+Handling of the query parameter `deactivated` in [List Accounts](https://element-hq.github.io/synapse/v1.99/admin_api/user_admin_api.html#list-accounts) [admin API](https://element-hq.github.io/synapse/v1.99/usage/administration/admin_api/index.html) adjusted, to filter deactivated users in user queries.
\ No newline at end of file
diff --git a/docs/admin_api/user_admin_api.md b/docs/admin_api/user_admin_api.md
index 70a9638e96..a97acd802a 100644
--- a/docs/admin_api/user_admin_api.md
+++ b/docs/admin_api/user_admin_api.md
@@ -163,7 +163,8 @@ Body parameters:
   not be changed. If `null` is given, the user type will be cleared.
   Other allowed options are: `bot` and `support`.
 
-## List Accounts (V2)
+## List Accounts
+### List Accounts (V2)
 
 This API returns all local user accounts.
 By default, the response is ordered by ascending user ID.
@@ -287,7 +288,7 @@ The following fields are returned in the JSON response body:
 
 *Added in Synapse 1.93:* the `locked` query parameter and response field.
 
-## List Accounts (V3)
+### List Accounts (V3)
 
 This API returns all local user accounts (see v2). In contrast to v2, the query parameter `deactivated` is handled differently.
 
diff --git a/synapse/rest/admin/users.py b/synapse/rest/admin/users.py
index b6e3499d91..3ecacc566d 100644
--- a/synapse/rest/admin/users.py
+++ b/synapse/rest/admin/users.py
@@ -118,7 +118,7 @@ async def on_GET(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
                 errcode=Codes.INVALID_PARAM,
             )
 
-        deactivated = self.__parse_parameter_deactivated(request)
+        deactivated = self._parse_parameter_deactivated(request)
 
         locked = parse_boolean(request, "locked", default=False)
         admins = parse_boolean(request, "admins")
@@ -183,14 +183,14 @@ def _filter(a: attr.Attribute) -> bool:
 
         return HTTPStatus.OK, ret
 
-    def __parse_parameter_deactivated(self, request: SynapseRequest) -> bool | None:
+    def _parse_parameter_deactivated(self, request: SynapseRequest) -> bool | None:
         return None if parse_boolean(request, "deactivated") else False
 
 
 class UsersRestServletV3(UsersRestServletV2):
     PATTERNS = admin_patterns("/users$", "v3")
 
-    def __parse_parameter_deactivated(self, request: SynapseRequest) -> bool | None:
+    def _parse_parameter_deactivated(self, request: SynapseRequest) -> bool | None:
         return parse_boolean(request, "deactivated")
 
 
diff --git a/tests/rest/admin/test_user.py b/tests/rest/admin/test_user.py
index 54f05f342b..cb208ead57 100644
--- a/tests/rest/admin/test_user.py
+++ b/tests/rest/admin/test_user.py
@@ -503,7 +503,7 @@ def test_all_users(self) -> None:
 
         channel = self.make_request(
             "GET",
-            self.url + "?deactivated=true",
+            f"{self.url}?deactivated=true",
             {},
             access_token=self.admin_user_tok,
         )
@@ -1180,7 +1180,7 @@ def test_erasure_status(self) -> None:
         # They should appear in the list users API, marked as not erased.
         channel = self.make_request(
             "GET",
-            self.url,
+            f"{self.url}?deactivated=true",
             access_token=self.admin_user_tok,
         )
         users = {user["name"]: user for user in channel.json_body["users"]}
@@ -1244,7 +1244,7 @@ def _order_test(
             dir: The direction of ordering to give the server
         """
 
-        url = self.url + "?"
+        url = f"{self.url}?deactivated=true&"
         if order_by is not None:
             url += "order_by=%s&" % (order_by,)
         if dir is not None and dir in ("b", "f"):