diff --git a/CRM/Contact/Page/AJAX.php b/CRM/Contact/Page/AJAX.php
index 82b605a4989f..555f42a4e9fe 100644
--- a/CRM/Contact/Page/AJAX.php
+++ b/CRM/Contact/Page/AJAX.php
@@ -959,25 +959,39 @@ static function selectUnselectContacts() {
   static function toggleDedupeSelect() {
     $rgid = CRM_Utils_Type::escape($_REQUEST['rgid'], 'Integer');
     $gid  = CRM_Utils_Type::escape($_REQUEST['gid'], 'Integer');
-    $pnid = CRM_Utils_Type::escape($_REQUEST['pnid'], 'Integer');
+    $pnid = $_REQUEST['pnid'];
     $isSelected = CRM_Utils_Type::escape($_REQUEST['is_selected'], 'Boolean');
     
     $contactType = CRM_Core_DAO::getFieldValue('CRM_Dedupe_DAO_RuleGroup', $rgid, 'contact_type');
     $cacheKeyString  = "merge $contactType";
     $cacheKeyString .= $rgid ? "_{$rgid}" : '_0';
     $cacheKeyString .= $gid ? "_{$gid}" : '_0';
-
-    $sql = "UPDATE civicrm_prevnext_cache SET is_selected = %1 WHERE id = %2 AND cacheKey LIKE %3";
+    
+    
     $params = array( 
       1 => array($isSelected, 'Boolean'),
-      2 => array($pnid, 'Integer'),
       3 => array("$cacheKeyString%", 'String') // using % to address rows with conflicts as well
     );
+
+    //check pnid is_array or integer
+    $whereClause = NULL;
+    if (is_array($pnid) && !CRM_Utils_Array::crmIsEmptyArray($pnid)) {
+      $pnid = implode(', ', $pnid);
+      $pnid = CRM_Utils_Type::escape($pnid, 'String');
+      $whereClause = " id IN ( {$pnid} ) ";
+    }
+    else {
+      $pnid = CRM_Utils_Type::escape($pnid, 'Integer');
+      $whereClause = " id = %2";
+      $params[2]   = array($pnid, 'Integer');
+    }
+    
+    $sql = "UPDATE civicrm_prevnext_cache SET is_selected = %1 WHERE {$whereClause} AND cacheKey LIKE %3";
     CRM_Core_DAO::executeQuery($sql, $params);
 
     CRM_Utils_System::civiExit();
   }
-
+  
   /**
    * @param $name
    *
diff --git a/CRM/Core/xml/Menu/Contact.xml b/CRM/Core/xml/Menu/Contact.xml
index 2196378239a3..cde8148ce1de 100644
--- a/CRM/Core/xml/Menu/Contact.xml
+++ b/CRM/Core/xml/Menu/Contact.xml
@@ -393,7 +393,7 @@
 <item>
      <path>civicrm/ajax/toggleDedupeSelect</path>
      <page_callback>CRM_Contact_Page_AJAX::toggleDedupeSelect</page_callback>
-     <access_arguments>access CiviCRM</access_arguments>
+     <access_arguments>merge duplicate contacts</access_arguments>
 </item>
 <item>
   <path>civicrm/activity/sms/add</path>
diff --git a/templates/CRM/Contact/Page/DedupeFind.tpl b/templates/CRM/Contact/Page/DedupeFind.tpl
index c5602a4abca4..fd1a84e607f3 100644
--- a/templates/CRM/Contact/Page/DedupeFind.tpl
+++ b/templates/CRM/Contact/Page/DedupeFind.tpl
@@ -84,7 +84,7 @@
   <table id="dupePairs" class="nestedActivitySelector form-layout-compressed" cellspacing="0" width="100%">
     <thead>
       <tr class="columnheader"> 
-        <th class="crm-dedupe-merge">&nbsp;</th>
+        <th class="crm-dedupe-merge"><input type="checkbox" value="0" name="pnid_all" class="crm-dedupe-select-all"></th>
         <th class="crm-empty">&nbsp;</th>
         <th class="crm-contact">{ts}Contact{/ts} 1</th>
         <th class="crm-contact">{ts}Email{/ts} 1</th>
@@ -231,9 +231,21 @@ CRM.$(function($) {
     $(this).toggleClass('crm-row-selected');
     $('input.crm-dedupe-select', this).prop('checked', $(this).hasClass('crm-row-selected'));
     var sth = $('input.crm-dedupe-select', this);
-    toggleDedupeSelect(sth);
+    toggleDedupeSelect(sth, 0);
   });
-
+  
+  $('#dupePairs thead tr .crm-dedupe-merge').on('click', function() {
+    var checked = $('.crm-dedupe-select-all').prop('checked');
+    if (checked) {
+      $("#dupePairs tbody tr input[type='checkbox']").prop('checked', true);
+    }
+    else{
+      $("#dupePairs tbody tr input[type='checkbox']").prop('checked', false);
+    }
+    var sth = $('#dupePairs tbody tr');
+    toggleDedupeSelect(sth, 1);
+  });
+    
   // inline search boxes placed in tfoot
   $('#dupePairsColFilters thead th').each( function () {
     var title = $('#dupePairs thead th').eq($(this).index()).text();
@@ -271,9 +283,20 @@ CRM.$(function($) {
   }
 });
 
-function toggleDedupeSelect(element) {
-  var is_selected = CRM.$(element).prop('checked') ? 1: 0;
-  var id = CRM.$(element).prop('name').substr(5);
+function toggleDedupeSelect(element, isMultiple) {
+  if (!isMultiple) {
+    var is_selected = CRM.$(element).prop('checked') ? 1: 0;
+    var id = CRM.$(element).prop('name').substr(5);
+  }
+  else {
+    var id = [];
+    CRM.$(element).each(function() {
+      CRM.$(this).toggleClass('crm-row-selected');
+      var sth = CRM.$('input.crm-dedupe-select', this);
+      id.push(CRM.$(sth).prop('name').substr(5));
+    });
+    var is_selected = CRM.$('.crm-dedupe-select-all').prop('checked') ? 1 : 0;
+  }
 
   var dataUrl = {/literal}"{crmURL p='civicrm/ajax/toggleDedupeSelect' h=0 q='snippet=4'}"{literal};
   var rgid = {/literal}"{$rgid}"{literal};