diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index cf87657..9f9fbd5 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -42,8 +42,8 @@ class Configuration implements ConfigurationInterface
                 ->scalarNode('max_front_lines')->defaultValue(null)->end()
                 ->scalarNode('max_behind_lines')->defaultValue(null)->end()
                 ->scalarNode('interpolation')->defaultValue(true)->end()
-                ->arrayNode('background_color')->prototype('scalar')->end()
-                ->arrayNode('text_color')->prototype('scalar')->end()
+                ->arrayNode('text_color')->prototype('scalar')->end()->end()
+                ->arrayNode('background_color')->prototype('scalar')->end()->end()
             ->end()
         ;
 
diff --git a/Generator/CaptchaGenerator.php b/Generator/CaptchaGenerator.php
index d4440fa..60db59b 100644
--- a/Generator/CaptchaGenerator.php
+++ b/Generator/CaptchaGenerator.php
@@ -98,8 +98,7 @@ class CaptchaGenerator
         $this->builder->setMaxFrontLines($options['max_front_lines']);
         $this->builder->setMaxBehindLines($options['max_behind_lines']);
 
-
-        if (isset($options['text_color'])) {
+        if (isset($options['text_color']) && $options['text_color']) {
             if (count($options['text_color']) !== 3) {
                 throw new \RuntimeException('text_color should be an array of r, g and b');
             }
@@ -108,7 +107,7 @@ class CaptchaGenerator
             $this->builder->setTextColor($color[0], $color[1], $color[2]);
         }
 
-        if (isset($options['background_color'])) {
+        if (isset($options['background_color']) && $options['background_color']) {
             if (count($options['background_color']) !== 3) {
                 throw new \RuntimeException('background_color should be an array of r, g and b');
             }