diff --git a/APPL/API2/model_aut_sp.inc b/APPL/API2/model_aut_sp.inc
index c92c106b17..b5435ad973 100644
--- a/APPL/API2/model_aut_sp.inc
+++ b/APPL/API2/model_aut_sp.inc
@@ -81,11 +81,6 @@ function model_aut_sp(params)
             "label": L("aut_sp_algorithm"),
             "typ": "varchar"
         },
-        "duration": {
-            "dbs": "aut_sp_duration",
-            "label": L("aut_sp_duration"),
-            "typ": "number"
-        },
         "authorization": {
             "dbs": "fac_functie_key",
             "label": L("aut_sp_functie_key"),