diff --git a/lib/doc/Math.lyx b/lib/doc/Math.lyx
index cc0a704e1b..fa59dec80d 100644
--- a/lib/doc/Math.lyx
+++ b/lib/doc/Math.lyx
@@ -31803,7 +31803,7 @@ Macro
 
 
 \begin_inset FormulaMacro
-\renewcommand{\qG}[4][1,\,2]{#2_{#1}=-\frac{#3}{2}\pm\sqrt{\frac{#3^{2}}{4}-#4}}
+\newcommand{\qG}[4][1,\,2]{#2_{#1}=-\frac{#3}{2}\pm\sqrt{\frac{#3^{2}}{4}-#4}}
 \end_inset