diff --git a/scripts/_common.sh b/scripts/_common.sh
index d3f2c48..60591b3 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -49,11 +49,11 @@ ynh_install_apps() {
     for i in "${apps_list[@]}"
     do
         # Retrieve the name of the app (part before _ynh)
-        local oneapp=$(echo "$i" | awk -F'[_ynh]' '{print $1}')
+        local oneapp=$(echo "$i" | awk -F'_ynh' '{print $1}')
         [ -z "$oneapp" ] && ynh_die --message="You didn't provided a YunoHost app to install"
 
         # Retrieve the arguments of the app (part after ?)
-        local oneargument=$(echo "$i" | awk -F'[?]' '{print $2}')
+        local oneargument=$(echo "$i" | awk -F'?' '{print $2}')
         [ ! -z "$oneargument" ] && oneargument="--args \"$oneargument\""
 
         if ! yunohost app list | grep -q "$oneapp"
@@ -91,7 +91,7 @@ ynh_remove_apps() {
     for i in "${apps_list[@]}"
     do
         # Retrieve the name of the app (part before _ynh)
-        local oneapp=$(echo "$i" | awk -F'[_ynh]' '{print $1}')
+        local oneapp=$(echo "$i" | awk -F'_ynh' '{print $1}')
         [ -z "$oneapp" ] && ynh_die --message="You didn't provided a YunoHost app to remove"
 
         ynh_app_setting_delete --app=$app --key=require_$oneapp