diff --git a/src/InsertOnDuplicateKey.php b/src/InsertOnDuplicateKey.php
index 6b9cf6e..c976018 100644
--- a/src/InsertOnDuplicateKey.php
+++ b/src/InsertOnDuplicateKey.php
@@ -196,16 +196,20 @@ protected static function getColumnList(array $first)
     /**
      * Build a value list.
      *
-     * @param array $first
+     * @param array $updatedColumns
      *
      * @return string
      */
-    protected static function buildValuesList(array $first)
+    protected static function buildValuesList(array $updatedColumns)
     {
         $out = [];
 
-        foreach (array_keys($first) as $key) {
-            $out[] = sprintf('`%s` = VALUES(`%s`)', $key, $key);
+        foreach ($updatedColumns as $key => $value) {
+            if (is_numeric($key)) {
+                $out[] = sprintf('`%s` = VALUES(`%s`)', $value, $value);
+            } else {
+                $out[] = sprintf('%s = %s', $key, $value);
+            }
         }
 
         return implode(', ', $out);
@@ -240,9 +244,9 @@ protected static function buildInsertOnDuplicateSql(array $data, array $updateCo
         $sql .= 'ON DUPLICATE KEY UPDATE ';
 
         if (empty($updateColumns)) {
-            $sql .= static::buildValuesList($first);
+            $sql .= static::buildValuesList(array_keys($first));
         } else {
-            $sql .= static::buildValuesList(array_combine($updateColumns, $updateColumns));
+            $sql .= static::buildValuesList($updateColumns);
         }
 
         return $sql;
diff --git a/tests/MainTest.php b/tests/MainTest.php
index 52f7974..9b3d6bd 100644
--- a/tests/MainTest.php
+++ b/tests/MainTest.php
@@ -63,11 +63,29 @@ public function testGetColumnList()
 
     public function testBuildValuesList()
     {
-        $data = $this->getDataForInsert();
+        $value = [
+            'id',
+            'email',
+            'name'
+        ];
 
         $expected = '`id` = VALUES(`id`), `email` = VALUES(`email`), `name` = VALUES(`name`)';
 
-        $result = $this->invokeMethod($this->user, 'buildValuesList', [$data[0]]);
+        $result = $this->invokeMethod($this->user, 'buildValuesList', [$value]);
+
+        $this->assertEquals($expected, $result);
+    }
+
+    public function testBuildValuesListAssociativeArray()
+    {
+        $value = [
+            'id' => 'id + 1',
+            'counter' => 'counter + 2',
+        ];
+
+        $expected = 'id = id + 1, counter = counter + 2';
+
+        $result = $this->invokeMethod($this->user, 'buildValuesList', [$value]);
 
         $this->assertEquals($expected, $result);
     }
@@ -152,6 +170,19 @@ public function testBuildInsertOnDuplicateSqlMultipleWithUpdateColumn()
         $this->assertEquals($expected, $result);
     }
 
+    public function testUpdatedColumnIsAssociativeArray()
+    {
+        $data = $this->getDataForInsert();
+
+        $expected = 'INSERT INTO `prefix_test_user_table`(`id`,`email`,`name`) VALUES
+(?,?,?), (?,?,?), (?,?,?)
+ON DUPLICATE KEY UPDATE counter = counter + 1';
+
+        $result = $this->invokeMethod($this->user, 'buildInsertOnDuplicateSql', [$data, ['counter' => 'counter + 1']]);
+
+        $this->assertEquals($expected, $result);
+    }
+
     public function testBuildInsertIgnoreSqlSimple()
     {
         $data = [