diff --git a/earthkit/meteo/utils/array.py b/earthkit/meteo/utils/array.py
index 121741d..cdf1599 100644
--- a/earthkit/meteo/utils/array.py
+++ b/earthkit/meteo/utils/array.py
@@ -28,7 +28,7 @@ def api(self):
                         self._api = None
         return self._api
 
-    def namespace(self, *arrays):
+    def namespace(self, arrays):
         if not arrays:
             import numpy as np