diff --git a/src/Builder.php b/src/Builder.php
index 7e0dcfa..2f47628 100644
--- a/src/Builder.php
+++ b/src/Builder.php
@@ -124,7 +124,7 @@ public function select($columns = ['*'])
      */
     public function where($column, $operator = null, $value = null, $boolean = 'and')
     {
-        if (!in_array(strtolower($operator), $this->operators, true)) {
+        if (! $column instanceof Closure && !in_array(strtolower($operator), $this->operators, true)) {
             list($value, $operator) = [$operator, '='];
         }