diff --git a/views/app/app_list.ms b/views/app/app_list.ms
index 0c5af702..3d5d1866 100644
--- a/views/app/app_list.ms
+++ b/views/app/app_list.ms
@@ -59,7 +59,7 @@
             <div class="form-group has-feedback">
                 <label for="label" class="col-sm-12">{{t 'url'}}</label>
                 <div class="col-sm-12">
-                    <input type="url" id="url" name="url" class="form-control" value="" placeholder="https://github.com/USER/REPOSITORY" required pattern="^https://github.com/[a-z]*/[a-z]*">
+                    <input type="url" id="url" name="url" class="form-control" value="" placeholder="https://github.com/USER/REPOSITORY" required pattern="^https://github.com/[a-z-_]*/[a-z-_]*">
                     <p class="text-warning">
                         <span class="fa-github"></span> {{t 'custom_app_url_only_github'}}
                     </p>