diff --git a/tox.ini b/tox.ini
index 2b35bba9..13c35cc9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -49,7 +49,7 @@ commands =
     sphinx-build -W -b html doc/source doc/build/html
 
 [flake8]
-# H106: Don’t put vim configuration in source files
+# H106: Don't put vim configuration in source files
 # H203: Use assertIs(Not)None to check for None
 enable-extensions=H106,H203
 show-source = true