diff --git a/toolbox.py b/toolbox.py
index 7c329ed..f6c8bf1 100644
--- a/toolbox.py
+++ b/toolbox.py
@@ -3,7 +3,6 @@ import mdtex2html
 import threading
 import importlib
 import traceback
-import importlib
 import inspect
 import re
 from latex2mathml.converter import convert as tex2mathml