diff --git a/build_svprognu b/build_svprognu
index 80c23af..fce0f07 100755
--- a/build_svprognu
+++ b/build_svprognu
@@ -34,7 +34,7 @@ case $opt in
 	#Vérification montage support
 	if mount | grep -q $OPTARG > /dev/null
         	then
-        	umount $OPTARG* > /dev/null
+        	umount $OPTARG* || /bin/true
 	fi
 
 	#Réinitialisation de la clé : Table DOS