diff --git a/lib/Alchemy/Phrasea/Command/Developer/LessCompiler.php b/lib/Alchemy/Phrasea/Command/Developer/LessCompiler.php
index 3fa29f0c94..7a59c8ef21 100644
--- a/lib/Alchemy/Phrasea/Command/Developer/LessCompiler.php
+++ b/lib/Alchemy/Phrasea/Command/Developer/LessCompiler.php
@@ -12,6 +12,7 @@
 namespace Alchemy\Phrasea\Command\Developer;
 
 use Alchemy\Phrasea\Command\Command;
+use Alchemy\Phrasea\Exception\RuntimeException;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
 
@@ -51,10 +52,10 @@ class LessCompiler extends Command
 
         $output->writeln('Building Assets...');
 
-        $errors = $this->container['phraseanet.less-builder']->build($files);
-        
-        if (count($errors) > 0) {
-            $output->writeln(sprintf('<error>Errors occured during the build %s</error>', implode(', ', $errors)));
+        try {
+            $this->container['phraseanet.less-builder']->build($files);
+        } catch (RuntimeException $e) {
+            $output->writeln(sprintf('<error>Could not build less files %s</error>', implode(', ', $e->getMessage())));
 
             return 1;
         }
diff --git a/lib/Alchemy/Phrasea/Command/Plugin/AbstractPluginCommand.php b/lib/Alchemy/Phrasea/Command/Plugin/AbstractPluginCommand.php
index f3bec54a1f..f9b8850335 100644
--- a/lib/Alchemy/Phrasea/Command/Plugin/AbstractPluginCommand.php
+++ b/lib/Alchemy/Phrasea/Command/Plugin/AbstractPluginCommand.php
@@ -44,11 +44,12 @@ abstract class AbstractPluginCommand extends Command
         );
 
         $output->write('Building Assets...');
-        $errors = $this->container['phraseanet.less-builder']->build($files);
-
-        if (count($errors) > 0) {
-            $output->writeln(sprintf('<error>Error(s) occured during the build %s</error>', implode(', ', $errors)));
+        
+        try {
+            $this->container['phraseanet.less-builder']->build($files);
+            $output->writeln(" <comment>OK</comment>");
+        } catch (RuntimeException $e) {
+            $output->writeln(sprintf('<error>Could not build less files %s</error>', implode(', ', $e->getMessage())));
         }
-        $output->writeln(" <comment>OK</comment>");
     }
 }
diff --git a/lib/Alchemy/Phrasea/Utilities/Less/Builder.php b/lib/Alchemy/Phrasea/Utilities/Less/Builder.php
index 607f1c950a..06091a07ea 100644
--- a/lib/Alchemy/Phrasea/Utilities/Less/Builder.php
+++ b/lib/Alchemy/Phrasea/Utilities/Less/Builder.php
@@ -38,20 +38,9 @@ class Builder
      */
     public function build($files)
     {
-        $failures = 0;
-        $errors = array();
-
         foreach ($files as $lessFile => $target) {
             $this->filesystem->mkdir(dirname($target));
-
-            try {
-                $this->compiler->compile($target, $lessFile);
-            } catch (\Exception $e) {
-                $failures++;
-                $errors[] = $e->getMessage();
-            }
+            $this->compiler->compile($target, $lessFile);
         }
-
-        return $errors;
     }
 }
diff --git a/lib/Alchemy/Phrasea/Utilities/Less/Compiler.php b/lib/Alchemy/Phrasea/Utilities/Less/Compiler.php
index 5047546f09..f87a475638 100644
--- a/lib/Alchemy/Phrasea/Utilities/Less/Compiler.php
+++ b/lib/Alchemy/Phrasea/Utilities/Less/Compiler.php
@@ -36,6 +36,14 @@ class Compiler
         return new self($app['filesystem'], RecessDriver::create($binaries));
     }
 
+    /**
+     * Compile LESS files
+     *
+     * @param string $target
+     * @param string $files
+     *
+     * @throws RuntimeException
+     */
     public function compile($target, $files)
     {
         $this->filesystem->mkdir(dirname($target));
diff --git a/tests/Alchemy/Tests/Phrasea/Utilities/Less/BuilderTest.php b/tests/Alchemy/Tests/Phrasea/Utilities/Less/BuilderTest.php
index 811a0e761e..3623d42c2e 100644
--- a/tests/Alchemy/Tests/Phrasea/Utilities/Less/BuilderTest.php
+++ b/tests/Alchemy/Tests/Phrasea/Utilities/Less/BuilderTest.php
@@ -27,8 +27,6 @@ class BuilderTest extends \PHPUnit_Framework_TestCase
 
         $builder = new Builder($compiler, $filesystem);
 
-        $build = $builder->build(array( __FILE__ => __DIR__ . '/output.css'));
-
-        $this->assertTrue($build);
+        $builder->build(array( __FILE__ => __DIR__ . '/output.css'));
     }
 }