diff --git a/main.py b/main.py
index 498dc1d..e34df74 100644
--- a/main.py
+++ b/main.py
@@ -53,7 +53,7 @@ def clickhouse():
     if not query:
         return app.send_static_file('play.html')
 
-   if database:
+    if database:
         query = f"USE {database}; {query}".encode()
 
     result, errmsg = chdb_query_with_errmsg(query, format)
@@ -61,7 +61,6 @@ def clickhouse():
         return result
     return errmsg
 
-
 @app.route('/', methods=["POST"])
 @auth.login_required
 def play():