diff --git a/src/math/mathop.pysty b/src/math/mathop.pysty
index 9f19d58..10ecf18 100644
--- a/src/math/mathop.pysty
+++ b/src/math/mathop.pysty
@@ -197,7 +197,7 @@ __END_OPTIONS_X__
 
 %Taken from user egreg on
 %   https://tex.stackexchange.com/a/22255
-\newcommand\restriction[2]{{% we make the whole thing an ordinary symbol
+\newcommand\frestriction[2]{{% we make the whole thing an ordinary symbol
   \left.\kern-\nulldelimiterspace % automatically resize the bar with \right
   #1 % the function
   \vphantom{\big|} % pretend it's a little taller at normal size