diff --git a/osm_nbi/validation.py b/osm_nbi/validation.py
index 2fc399f..c5f3ef2 100644
--- a/osm_nbi/validation.py
+++ b/osm_nbi/validation.py
@@ -497,7 +497,7 @@
         # "vim_url_admin": description_schema,
         # "vim_tenant": name_schema,
         "vim_tenant_name": name_schema,
-        "vim_user": shortname_schema,
+        "vim_user": string_schema,
         "vim_password": passwd_schema,
         "vca": id_schema,
         "config": {"type": "object"},
@@ -521,7 +521,7 @@
         # "vim_url_admin": description_schema,
         # "vim_tenant": name_schema,
         "vim_tenant_name": name_schema,
-        "vim_user": shortname_schema,
+        "vim_user": string_schema,
         "vim_password": passwd_schema,
         "vca": id_schema,
         "config": {"type": "object"},