diff --git a/tools/style/notbeamer.sty b/tools/style/notbeamer.sty
index c7324d3..d3ebaa8 100755
--- a/tools/style/notbeamer.sty
+++ b/tools/style/notbeamer.sty
@@ -67,7 +67,7 @@
     \end{encadre}
 }
 
-\renewenvironment{definition}[1][]
+\newenvironment{definition}[1][]
 {
     \begin{encadre}{Définition #1}
         }{