diff --git a/src/ext/spout/SpoutBuilder.php b/src/ext/spout/SpoutBuilder.php
index ad1035c..83ba5e1 100644
--- a/src/ext/spout/SpoutBuilder.php
+++ b/src/ext/spout/SpoutBuilder.php
@@ -6,7 +6,6 @@ use nulib\file\tab\AbstractBuilder;
 use nulib\file\tab\TAbstractBuilder;
 use nulib\os\path;
 use nulib\php\func;
-use nulib\php\nur_func;
 use nulib\php\time\Date;
 use nulib\php\time\DateTime;
 use nulib\ref\ext\spout\ref_builder;
@@ -324,13 +323,8 @@ class SpoutBuilder extends AbstractBuilder {
       }
       if (array_key_exists("cook_func", $sheetParams)) {
         $cookFunc = $sheetParams["cook_func"] ?? null;
-        $cookCtx = $cookArgs = null;
-        if ($cookFunc !== null) {
-          nur_func::ensure_func($cookFunc, $this, $cookArgs);
-          $cookCtx = nur_func::_prepare($cookFunc);
-        }
-        $this->cookCtx = $cookCtx;
-        $this->cookArgs = $cookArgs;
+        if ($cookFunc !== null) $cookFunc = func::with($cookFunc)->bind($this);
+        $this->cookFunc = $cookFunc;
       }
     }
     return $this;