diff --git a/src/math/mathop.pysty b/src/math/mathop.pysty
index 90a2090..0be9557 100644
--- a/src/math/mathop.pysty
+++ b/src/math/mathop.pysty
@@ -208,4 +208,5 @@ __END_OPTIONS_X__
 \newcommand\directlimit{\varinjlim}
 \newcommand\inverselimit{\varprojlim}
 
+\DeclareMathOperator*{\freeproduct}{\raisebox{-0.5ex}{\scalebox{2}{$\ast$}}}