diff --git a/src/doc/fr/a_tour_of_sage/conf.py b/src/doc/fr/a_tour_of_sage/conf.py
index 9cca4b7d1f8..0fcc6f5cc4b 100644
--- a/src/doc/fr/a_tour_of_sage/conf.py
+++ b/src/doc/fr/a_tour_of_sage/conf.py
@@ -49,7 +49,3 @@
   ('index', name + '.tex', 'A Tour Of Sage',
    'The Sage Development Team', 'manual'),
 ]
-
-# the definition of \\at in the standard preamble of the sphinx doc
-# conflicts with that in babel/french[b]
-latex_elements['preamble'] += '\\let\\at\\undefined'