diff --git a/scripts/upgrade b/scripts/upgrade
index 5a48397..f52fd20 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -25,9 +25,13 @@ sudo cp ../conf/settings.json /etc/transmission-daemon/settings.json
 sudo service transmission-daemon reload
 
 # Patch sources to add a download button
-sudo cp ../sources/toolbar-downloads.png /usr/share/transmission/web/style/transmission/images/toolbar-downloads.png
-sudo bash -c 'cat ../sources/ynh_common.css >> /usr/share/transmission/web/style/transmission/common.css'
-sudo sed -i "s@<div id=\"toolbar-inspector\" title=\"Toggle Inspector\"></div>@<div id=\"toolbar-inspector\" title=\"Toggle Inspector\"></div><div id=\"toolbar-separator\"></div><a href=\"../../downloads/\" id=\"toolbar-downloads\" title=\"Downloads\"></a>@g" /usr/share/transmission/web/index.html
+if grep 'toolbar-downloads' /usr/share/transmission/web/index.html --quiet; then
+    sudo cp ../sources/toolbar-downloads.png /usr/share/transmission/web/style/transmission/images/toolbar-downloads.png
+    sudo bash -c 'cat ../sources/ynh_common.css >> /usr/share/transmission/web/style/transmission/common.css'
+    sudo sed -i "s@<div id=\"toolbar-inspector\" title=\"Toggle Inspector\"></div>@<div id=\"toolbar-inspector\" title=\"Toggle Inspector\"></div><div id=\"toolbar-separator\"></div><a href=\"../../downloads/\" id=\"toolbar-downloads\" title=\"Downloads\"></a>@g" /usr/share/transmission/web/index.html
+fi
+
+
 
 # Configure Nginx and reload
 sed -i "s@PATHTOCHANGE@$path@g" ../conf/nginx.conf