diff --git a/src/math/mathop.pysty b/src/math/mathop.pysty
index 436350b..2f23187 100644
--- a/src/math/mathop.pysty
+++ b/src/math/mathop.pysty
@@ -80,6 +80,8 @@ __END_OPTIONS_X__
 \DeclareSimpleMathOperator{Mat}
 \DeclareSimpleMathOperator{ev}
 \DeclareSimpleMathOperator{tr}
+\DeclareSimpleMathOperator{GL}
+\DeclareSimpleMathOperator{PGL}
 
 %Algebra
 \DeclareSimpleMathOperator{Quot}