diff --git a/scripts/restore b/scripts/restore
index 804703b..3fb0021 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -89,12 +89,12 @@ ynh_install_app_dependencies $pkg_dependencies
 
 mkdir -p $final_path/transcode
 
-if [ -x /usr/bin/ffmpeg ]; then   # Check if 'ffmpeg' is installed and executable
+if [ -x /usr/bin/ffmpeg -a ! -e $final_path/transcode/ffmpeg ]; then   # Check if 'ffmpeg' is installed and executable
 	ln -s /usr/bin/ffmpeg $final_path/transcode
 fi
 
 # FIXME Not sure if 'lame' is needed ?
-if [ -x /usr/bin/lame ]; then   # Check if 'lame' is installed and executable
+if [ -x /usr/bin/lame -a ! -e $final_path/transcode/lame ]; then   # Check if 'lame' is installed and executable
 	ln -s /usr/bin/lame $final_path/transcode
 fi
 
diff --git a/scripts/upgrade b/scripts/upgrade
index 1c29d16..40370a5 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -119,12 +119,12 @@ ynh_system_user_create --username=$app
 
 mkdir -p $final_path/transcode
 
-if [ -x /usr/bin/ffmpeg ]; then   # Check if 'ffmpeg' is installed and executable
+if [ -x /usr/bin/ffmpeg -a ! -e $final_path/transcode/ffmpeg ]; then   # Check if 'ffmpeg' is installed and executable
 	ln -s /usr/bin/ffmpeg $final_path/transcode
 fi
 
 # FIXME Not sure if 'lame' is needed ?
-if [ -x /usr/bin/lame ]; then   # Check if 'lame' is installed and executable
+if [ -x /usr/bin/lame -a ! -e $final_path/transcode/lame ]; then   # Check if 'lame' is installed and executable
 	ln -s /usr/bin/lame $final_path/transcode
 fi