diff --git a/scripts/install b/scripts/install
index 3bb388b..fdb135c 100755
--- a/scripts/install
+++ b/scripts/install
@@ -23,7 +23,7 @@ ynh_abort_if_errors
 domain=$YNH_APP_ARG_DOMAIN
 path_url=$YNH_APP_ARG_PATH
 is_public=$YNH_APP_ARG_IS_PUBLIC
-mpd_ext= $YNH_APP_ARG_MPD_EXT
+mpd_ext=$YNH_APP_ARG_MPD_EXT
 
 app=$YNH_APP_INSTANCE_NAME