diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 98e995b..1b72967 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -22,6 +22,7 @@ class Configuration implements ConfigurationInterface
                 ->scalarNode('length')->defaultValue(5)->end()
                 ->scalarNode('width')->defaultValue(120)->end()
                 ->scalarNode('height')->defaultValue(40)->end()
+                ->scalarNode('keep_value')->defaultValue(true)->end()
                 ->scalarNode('charset')->defaultValue('abcdefhjkmnprstuvwxyz23456789')->end()
                 ->scalarNode('as_file')->defaultValue(false)->end()
                 ->scalarNode('image_folder')->defaultValue('captcha')->end()
diff --git a/Type/CaptchaType.php b/Type/CaptchaType.php
index 74269bb..6ff0a84 100755
--- a/Type/CaptchaType.php
+++ b/Type/CaptchaType.php
@@ -45,6 +45,12 @@ class CaptchaType extends AbstractType
      */
     protected $asFile;
 
+    /**
+     * Keep value between two requests ?
+     * @var boolean
+     */
+    protected $keepValue;
+
     /**
      * Charset used
      * @var string
@@ -96,8 +102,9 @@ class CaptchaType extends AbstractType
         $this->width = $config['width'];
         $this->height = $config['height'];
         $this->length = $config['length'];
-        $this->asFile = $config['as_file'];
         $this->charset = $config['charset'];
+        $this->keepValue = $config['keep_value'];
+        $this->asFile = $config['as_file'];
         $this->imageFolder = $config['image_folder'];
         $this->webPath = $config['web_path'];
         $this->gcFreq = $config['gc_freq'];
@@ -161,7 +168,7 @@ class CaptchaType extends AbstractType
 
     private function generateCaptchaValue()
     {
-        if (!$this->session->has($this->key)) {
+        if (!$this->keepValue || !$this->session->has($this->key)) {
             $value = '';
             $chars = str_split($this->charset);