diff --git a/lib/pleroma/web/api_spec/operations/chat_operation.ex b/lib/pleroma/web/api_spec/operations/chat_operation.ex
index 76c2db57e..7bc39acc6 100644
--- a/lib/pleroma/web/api_spec/operations/chat_operation.ex
+++ b/lib/pleroma/web/api_spec/operations/chat_operation.ex
@@ -31,7 +31,8 @@ defmodule Pleroma.Web.ApiSpec.ChatOperation do
             "The updated chat",
             "application/json",
             Chat
-          )
+          ),
+        404 => Operation.response("Not Found", "application/json", ApiError)
       },
       security: [
         %{
@@ -56,7 +57,8 @@ defmodule Pleroma.Web.ApiSpec.ChatOperation do
             "The read ChatMessage",
             "application/json",
             ChatMessage
-          )
+          ),
+        404 => Operation.response("Not Found", "application/json", ApiError)
       },
       security: [
         %{
@@ -87,7 +89,8 @@ defmodule Pleroma.Web.ApiSpec.ChatOperation do
             "The existing chat",
             "application/json",
             Chat
-          )
+          ),
+        404 => Operation.response("Not Found", "application/json", ApiError)
       },
       security: [
         %{
@@ -118,7 +121,8 @@ defmodule Pleroma.Web.ApiSpec.ChatOperation do
             "The created or existing chat",
             "application/json",
             Chat
-          )
+          ),
+        404 => Operation.response("Not Found", "application/json", ApiError)
       },
       security: [
         %{
@@ -146,7 +150,8 @@ defmodule Pleroma.Web.ApiSpec.ChatOperation do
         Operation.parameter(:pinned, :query, BooleanLike.schema(), "Include only pinned chats")
       ],
       responses: %{
-        200 => Operation.response("The chats of the user", "application/json", chats_response())
+        200 => Operation.response("The chats of the user", "application/json", chats_response()),
+        404 => Operation.response("Not Found", "application/json", ApiError)
       },
       security: [
         %{
@@ -172,7 +177,8 @@ defmodule Pleroma.Web.ApiSpec.ChatOperation do
         | pagination_params()
       ],
       responses: %{
-        200 => Operation.response("The chats of the user", "application/json", chats_response())
+        200 => Operation.response("The chats of the user", "application/json", chats_response()),
+        404 => Operation.response("Not Found", "application/json", ApiError)
       },
       security: [
         %{
@@ -224,6 +230,7 @@ defmodule Pleroma.Web.ApiSpec.ChatOperation do
             ChatMessage
           ),
         400 => Operation.response("Bad Request", "application/json", ApiError),
+        404 => Operation.response("Not Found", "application/json", ApiError),
         422 => Operation.response("MRF Rejection", "application/json", ApiError)
       },
       security: [
@@ -249,7 +256,8 @@ defmodule Pleroma.Web.ApiSpec.ChatOperation do
             "The deleted ChatMessage",
             "application/json",
             ChatMessage
-          )
+          ),
+        404 => Operation.response("Not Found", "application/json", ApiError)
       },
       security: [
         %{
@@ -268,7 +276,8 @@ defmodule Pleroma.Web.ApiSpec.ChatOperation do
         Operation.parameter(:id, :path, :string, "The id of the chat", required: true)
       ],
       responses: %{
-        200 => Operation.response("The existing chat", "application/json", Chat)
+        200 => Operation.response("The existing chat", "application/json", Chat),
+        404 => Operation.response("Not Found", "application/json", ApiError)
       },
       security: [
         %{
@@ -287,7 +296,8 @@ defmodule Pleroma.Web.ApiSpec.ChatOperation do
         Operation.parameter(:id, :path, :string, "The id of the chat", required: true)
       ],
       responses: %{
-        200 => Operation.response("The existing chat", "application/json", Chat)
+        200 => Operation.response("The existing chat", "application/json", Chat),
+        404 => Operation.response("Not Found", "application/json", ApiError)
       },
       security: [
         %{
diff --git a/test/pleroma/web/activity_pub/views/user_view_test.exs b/test/pleroma/web/activity_pub/views/user_view_test.exs
index a3f807ca9..1aed28d5b 100644
--- a/test/pleroma/web/activity_pub/views/user_view_test.exs
+++ b/test/pleroma/web/activity_pub/views/user_view_test.exs
@@ -220,5 +220,13 @@ defmodule Pleroma.Web.ActivityPub.UserViewTest do
                "acceptsChatMessages"
              )
     end
+
+    test "it returns false if chat is disabled" do
+      clear_config([Pleroma.Chat, :enabled], false)
+      user = insert(:user, accepts_chat_messages: true)
+
+      assert %{"capabilities" => %{"acceptsChatMessages" => false}} =
+               UserView.render("user.json", user: user)
+    end
   end
 end
diff --git a/test/pleroma/web/pleroma_api/controllers/chat_controller_test.exs b/test/pleroma/web/pleroma_api/controllers/chat_controller_test.exs
index 0dc0e7014..8244ba434 100644
--- a/test/pleroma/web/pleroma_api/controllers/chat_controller_test.exs
+++ b/test/pleroma/web/pleroma_api/controllers/chat_controller_test.exs
@@ -546,6 +546,14 @@ defmodule Pleroma.Web.PleromaAPI.ChatControllerTest do
         account_ids = Enum.map(result, &get_in(&1, ["account", "id"]))
         assert Enum.sort(account_ids) == Enum.sort([user2.id, user3.id])
       end
+
+      test "it returns 404 when chats are disabled", %{conn: conn} do
+        clear_config([Pleroma.Chat, :enabled], false)
+
+        conn
+        |> get(unquote(tested_endpoint))
+        |> json_response_and_validate_schema(404)
+      end
     end
   end
 end