diff --git a/application/Espo/Core/Utils/Database/Converters/Schema.php b/application/Espo/Core/Utils/Database/Converters/Schema.php
index a6425f9381..aae693cfb1 100644
--- a/application/Espo/Core/Utils/Database/Converters/Schema.php
+++ b/application/Espo/Core/Utils/Database/Converters/Schema.php
@@ -18,6 +18,7 @@ class Schema
 		'default' => 'default',
 		'notnull' => 'notnull',
 		'autoincrement' => 'autoincrement',
+		'unique' => 'unique',
 	);
 
 
diff --git a/application/Espo/Resources/metadata/fields/autoincrement.json b/application/Espo/Resources/metadata/fields/autoincrement.json
index a9e95aefea..3147548af4 100644
--- a/application/Espo/Resources/metadata/fields/autoincrement.json
+++ b/application/Espo/Resources/metadata/fields/autoincrement.json
@@ -7,6 +7,7 @@
    },
    "database":{
       "type":"int",
-      "autoincrement":true
+      "autoincrement":true,
+	  "unique":true
    }
 }
diff --git a/vendor/doctrine/dbal/lib/Doctrine/DBAL/Platforms/MySqlPlatform.php b/vendor/doctrine/dbal/lib/Doctrine/DBAL/Platforms/MySqlPlatform.php
index 73e5e691ea..a9e774c597 100644
--- a/vendor/doctrine/dbal/lib/Doctrine/DBAL/Platforms/MySqlPlatform.php
+++ b/vendor/doctrine/dbal/lib/Doctrine/DBAL/Platforms/MySqlPlatform.php
@@ -541,6 +541,7 @@ class MySqlPlatform extends AbstractPlatform
             $column = $columnDiff->column;
             $columnArray = $column->toArray();
             $columnArray['comment'] = $this->getColumnComment($column);
+
             $queryParts[] =  'CHANGE ' . ($columnDiff->oldColumnName) . ' '
                     . $this->getColumnDeclarationSQL($column->getQuotedName($this), $columnArray);
         }
diff --git a/vendor/doctrine/dbal/lib/Doctrine/DBAL/Schema/Column.php b/vendor/doctrine/dbal/lib/Doctrine/DBAL/Schema/Column.php
index c086c86a1e..e4467a680b 100644
--- a/vendor/doctrine/dbal/lib/Doctrine/DBAL/Schema/Column.php
+++ b/vendor/doctrine/dbal/lib/Doctrine/DBAL/Schema/Column.php
@@ -76,6 +76,11 @@ class Column extends AbstractAsset
      */
     protected $_autoincrement = false;
 
+	/**
+     * @var boolean
+     */
+    protected $_unique = false;   //espo
+
     /**
      * @var array
      */
@@ -222,6 +227,18 @@ class Column extends AbstractAsset
         return $this;
     }
 
+	/**
+     * @param boolean $unique
+     *
+     * @return \Doctrine\DBAL\Schema\Column
+     */
+    public function setUnique($unique) //espo
+    {
+        $this->_unique = (bool)$unique;
+
+        return $this;
+    }
+
     /**
      * @param mixed $default
      *
@@ -487,6 +504,7 @@ class Column extends AbstractAsset
             'fixed'         => $this->_fixed,
             'unsigned'      => $this->_unsigned,
             'autoincrement' => $this->_autoincrement,
+            'unique' => $this->_unique, //espo
             'columnDefinition' => $this->_columnDefinition,
             'comment' => $this->_comment,
         ), $this->_platformOptions, $this->_customSchemaOptions);