diff --git a/mappers/date.inc b/mappers/date.inc
index 8a75687..081ae88 100644
--- a/mappers/date.inc
+++ b/mappers/date.inc
@@ -21,7 +21,7 @@ function date_feeds_processor_targets_alter(&$targets, $entity_type, $bundle_nam
         'callback' => 'date_feeds_set_target',
         'description' => t('The start date for the @name field. Also use if mapping both start and end.', array('@name' => $instance['label'])),
         'real_target' => $name,
-        'post_process' => 'feeds_filter_empty_field_items',
+        'post_process' => array('feeds_filter_empty_field_items'),
       );
       $targets[$name . ':end'] = array(
         'name' => t('@name: End', array('@name' => $instance['label'])),
diff --git a/mappers/file.inc b/mappers/file.inc
index 65c6be6..ca4b5bb 100644
--- a/mappers/file.inc
+++ b/mappers/file.inc
@@ -21,7 +21,7 @@ function file_feeds_processor_targets_alter(&$targets, $entity_type, $bundle_nam
         'callback' => 'file_feeds_set_target',
         'description' => t('The URI of the @label field.', array('@label' => $instance['label'])),
         'real_target' => $name,
-        'post_process' => 'feeds_filter_empty_field_items',
+        'post_process' => array('feeds_filter_empty_field_items'),
       );
 
       if ($info['type'] == 'image') {
diff --git a/mappers/link.inc b/mappers/link.inc
index 6a43644..8d324e1 100644
--- a/mappers/link.inc
+++ b/mappers/link.inc
@@ -20,7 +20,7 @@ function link_feeds_processor_targets_alter(&$targets, $entity_type, $bundle_nam
           'callback' => 'link_feeds_set_target',
           'description' => t('The @label field of the entity.', array('@label' => $instance['label'])),
           'real_target' => $name,
-          'post_process' => 'feeds_filter_empty_field_items',
+          'post_process' => array('feeds_filter_empty_field_items'),
         );
       }
       if (array_key_exists('title', $info['columns'])) {
diff --git a/mappers/number.inc b/mappers/number.inc
index baf548d..e93bd0b 100644
--- a/mappers/number.inc
+++ b/mappers/number.inc
@@ -27,7 +27,7 @@ function number_feeds_processor_targets_alter(&$targets, $entity_type, $bundle_n
         'name' => check_plain($instance['label']),
         'callback' => 'number_feeds_set_target',
         'description' => t('The @label field of the entity.', array('@label' => $instance['label'])),
-        'post_process' => 'feeds_filter_empty_field_items',
+        'post_process' => array('feeds_filter_empty_field_items'),
       );
     }
   }
diff --git a/mappers/taxonomy.inc b/mappers/taxonomy.inc
index 1bcc584..4875a98 100644
--- a/mappers/taxonomy.inc
+++ b/mappers/taxonomy.inc
@@ -67,7 +67,7 @@ function taxonomy_feeds_processor_targets_alter(&$targets, $entity_type, $bundle
         'description' => t('The @label field of the entity.', array('@label' => $instance['label'])),
         'summary_callback' => 'taxonomy_feeds_summary_callback',
         'form_callback' => 'taxonomy_feeds_form_callback',
-        'post_process' => 'feeds_filter_empty_field_items',
+        'post_process' => array('feeds_filter_empty_field_items'),
       );
     }
   }
diff --git a/mappers/text.inc b/mappers/text.inc
index 874c2a1..ead69b1 100644
--- a/mappers/text.inc
+++ b/mappers/text.inc
@@ -25,7 +25,7 @@ function text_feeds_processor_targets_alter(&$targets, $entity_type, $bundle_nam
         'name' => check_plain($instance['label']),
         'callback' => 'text_feeds_set_target',
         'description' => t('The @label field of the entity.', array('@label' => $instance['label'])),
-        'post_process' => 'feeds_filter_empty_field_items',
+        'post_process' => array('feeds_filter_empty_field_items'),
       );
     }
   }
diff --git a/plugins/FeedsProcessor.inc b/plugins/FeedsProcessor.inc
index 83d85d7..7d239c6 100755
--- a/plugins/FeedsProcessor.inc
+++ b/plugins/FeedsProcessor.inc
@@ -520,13 +520,15 @@ abstract class FeedsProcessor extends FeedsPlugin {
 
     foreach ($this->config['mappings'] as $mapping) {
       $target = $mapping['target'];
+
       if (isset($targets[$this->id][$target]) &&
           is_array($targets[$this->id][$target]) &&
           isset($targets[$this->id][$target]['post_process']) &&
-          function_exists($targets[$this->id][$target]['post_process'])) {
+          is_array($targets[$this->id][$target]['post_process'])) {
 
-        $callback = $targets[$this->id][$target]['post_process'];
-        $callback($source, $target_item, $target, $targets[$this->id][$target]);
+        foreach ($targets[$this->id][$target]['post_process'] as $callback) {
+          $callback($source, $target_item, $target, $targets[$this->id][$target]);
+        }
       }
     }