diff --git a/mirrortea/__main__.py b/mirrortea/__main__.py
index 8904c06..5d076cd 100644
--- a/mirrortea/__main__.py
+++ b/mirrortea/__main__.py
@@ -19,10 +19,10 @@ CREATE TABLE IF NOT EXISTS telegram_user_matrix_chats (
 TELEGRAM_USERS_SQL = '''
 CREATE TABLE IF NOT EXISTS telegram_users
 (
-   id INTEGER PRIMARY KEY NOT NULL CHECK(id < 15),
-   first_name TEXT NOT NULL CHECK(first_name < 50),
-   last_name TEXT CHECK(last_name < 50,
-   username TEXT CHECK(username < 50),
+   id INTEGER PRIMARY KEY NOT NULL (15),
+   first_name TEXT NOT NULL (50),
+   last_name TEXT (50),
+   username TEXT (50),
 );
 '''