diff --git a/lib/pleroma/web/oauth/oauth_controller.ex b/lib/pleroma/web/oauth/oauth_controller.ex
index 7c1a3adbd..4309cf58f 100644
--- a/lib/pleroma/web/oauth/oauth_controller.ex
+++ b/lib/pleroma/web/oauth/oauth_controller.ex
@@ -114,7 +114,7 @@ def token_exchange(conn, %{"grant_type" => "authorization_code"} = params) do
         refresh_token: token.refresh_token,
         created_at: DateTime.to_unix(inserted_at),
         expires_in: 60 * 10,
-        scope: Enum.join(token.scopes)
+        scope: Enum.join(token.scopes, " ")
       }
 
       json(conn, response)