diff --git a/data/helpers.d/permission b/data/helpers.d/permission
index 46d703d7b..fb0e8722b 100644
--- a/data/helpers.d/permission
+++ b/data/helpers.d/permission
@@ -368,3 +368,22 @@ ynh_permission_has_user() {
 
     yunohost user permission info "$app.$permission" | grep --word-regexp --quiet "$user"
 }
+
+ynh_legacy_permissions_exists () {
+    for permission in "skipped" "unprotected" "protected"
+    do
+        if ynh_permission_exists --permission="legacy_${permission}_uris"; then
+            return 0
+        fi
+    done
+    return 1
+}
+
+ynh_legacy_permissions_delete_all () {
+    for permission in "skipped" "unprotected" "protected"
+    do
+        if ynh_permission_exists --permission="legacy_${permission}_uris"; then
+            ynh_permission_delete --permission="legacy_${permission}_uris"
+        fi
+    done
+}