diff --git a/handlers/views_handler_argument_string.inc b/handlers/views_handler_argument_string.inc
index dbb98fe..d9d1e45 100644
--- a/handlers/views_handler_argument_string.inc
+++ b/handlers/views_handler_argument_string.inc
@@ -32,6 +32,7 @@ class views_handler_argument_string extends views_handler_argument {
     $options['path_case'] = array('default' => 'none');
     $options['transform_dash'] = array('default' => FALSE, 'bool' => TRUE);
     $options['break_phrase'] = array('default' => FALSE, 'bool' => TRUE);
+    $options['not'] = array('default' => FALSE, 'bool' => TRUE);
 
     if (!empty($this->definition['many to one'])) {
       $options['add_table'] = array('default' => FALSE, 'bool' => TRUE);
@@ -123,6 +124,13 @@ class views_handler_argument_string extends views_handler_argument {
       '#default_value' => !empty($this->options['break_phrase']),
       '#fieldset' => 'more',
     );
+    $form['not'] = array(
+      '#type' => 'checkbox',
+      '#title' => t('Exclude'),
+      '#description' => t('If selected, the numbers entered for the filter will be excluded rather than limiting the view.'),
+      '#default_value' => !empty($this->options['not']),
+      '#fieldset' => 'more',
+    );
   }
 
   /**
@@ -198,21 +206,19 @@ class views_handler_argument_string extends views_handler_argument {
     }
 
     if (count($this->value) > 1) {
-      $operator = 'IN';
+      $operator = empty($this->options['not']) ? 'IN' : 'NOT IN';
       $argument = $this->value;
     }
     else {
-      $operator = '=';
+      $operator = empty($this->options['not']) ? '=' : '!=';
     }
 
     if ($formula) {
       $placeholder = $this->placeholder();
-      if ($operator == 'IN') {
-        $field .= " IN($placeholder)";
-      }
-      else {
-        $field .= ' = ' . $placeholder;
+      if (count($this->value) > 1) {
+        $placeholder = "($placeholder)";
       }
+      $field .= " $operator $placeholder";
       $placeholders = array(
         $placeholder => $argument,
       );