diff --git a/tools/gen_latex_symbols.py b/tools/gen_latex_symbols.py
index 0574c70..fabc696 100644
--- a/tools/gen_latex_symbols.py
+++ b/tools/gen_latex_symbols.py
@@ -82,6 +82,6 @@ reverse_latex_symbol = { v:k for k,v in latex_symbols.items()}
 
 fn = Path('..', 'IPython', 'core', 'latex_symbols.py')
 print("Writing the file: %s" % str(fn))
-fn.write_text(s, encoding='utf-8')
+fn.write_text(s, encoding="utf-8")