diff --git a/main.py b/main.py
index f498f92..d0a8f22 100644
--- a/main.py
+++ b/main.py
@@ -59,7 +59,7 @@ def list():
 @app.route("/list/user", methods=['GET'])
 def user_info():
     username = request.args.get("user")
-    c.execute("SELECT * FROM users WHERE username = '?'", [username])
+    c.execute("SELECT * FROM users WHERE username = ?", [username])
     user_list = c.fetchall()
     if user_list != []:
         user = user_list[0]
@@ -112,9 +112,9 @@ def remove_user():
 @app.route("/adduser/user", methods=['GET'])
 def adduser():
     user = request.args.get("username")
-    c.execute("SELECT * FROM users WHERE username='%s'", user) 
+    c.execute("SELECT * FROM users WHERE username=?", [user]) 
     if c.fetchall() == []:
-        c.execute("INSERT or IGNORE INTO users (username, balance) VALUES (%(user)s, 0)", {'user': user})
+        c.execute("INSERT or IGNORE INTO users (username, balance) VALUES (?, 0)", [user])
         conn.commit()
         return 'Added user <a href="/list">user and tag list</a> <p>The creator of this website accepts no liability for any linguistic or technical errors!</p>'
     else: