diff --git a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
index ac66be896a0c7..558fbd942f092 100644
--- a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
+++ b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
@@ -490,7 +490,7 @@ private function addServiceConfigurator($id, $definition, $variableName = 'insta
             $class = $this->dumpValue($callable[0]);
             // If the class is a string we can optimize call_user_func away
             if (strpos($class, "'") === 0) {
-                return sprintf("        %s::%s(\$%s);\n", substr($class, 1, -1), $callable[1], $variableName);
+                return sprintf("        \%s::%s(\$%s);\n", substr($class, 1, -1), $callable[1], $variableName);
             }
 
             return sprintf("        call_user_func(array(%s, '%s'), \$%s);\n", $this->dumpValue($callable[0]), $callable[1], $variableName);
@@ -701,7 +701,7 @@ private function addNewInstance($id, Definition $definition, $return, $instantia
 
                 // If the class is a string we can optimize call_user_func away
                 if (strpos($class, "'") === 0) {
-                    return sprintf("        $return{$instantiation}%s::%s(%s);\n", substr($class, 1, -1), $definition->getFactoryMethod(), $arguments ? implode(', ', $arguments) : '');
+                    return sprintf("        $return{$instantiation}\%s::%s(%s);\n", substr($class, 1, -1), $definition->getFactoryMethod(), $arguments ? implode(', ', $arguments) : '');
                 }
 
                 return sprintf("        $return{$instantiation}call_user_func(array(%s, '%s')%s);\n", $this->dumpValue($definition->getFactoryClass()), $definition->getFactoryMethod(), $arguments ? ', '.implode(', ', $arguments) : '');
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9.php
index 4be046ad7ea46..c6b8db298a61e 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9.php
@@ -138,7 +138,7 @@ protected function getFooService()
     {
         $a = $this->get('foo.baz');
 
-        $this->services['foo'] = $instance = FooClass::getInstance('foo', $a, array($this->getParameter('foo') => 'foo is '.$this->getParameter('foo').'', 'foobar' => $this->getParameter('foo')), true, $this);
+        $this->services['foo'] = $instance = \FooClass::getInstance('foo', $a, array($this->getParameter('foo') => 'foo is '.$this->getParameter('foo').'', 'foobar' => $this->getParameter('foo')), true, $this);
 
         $instance->setBar($this->get('bar'));
         $instance->initialize();
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php
index 1d8a5569d8138..24b11f0bc6e11 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php
@@ -148,7 +148,7 @@ protected function getFooService()
     {
         $a = $this->get('foo.baz');
 
-        $this->services['foo'] = $instance = FooClass::getInstance('foo', $a, array('bar' => 'foo is bar', 'foobar' => 'bar'), true, $this);
+        $this->services['foo'] = $instance = \FooClass::getInstance('foo', $a, array('bar' => 'foo is bar', 'foobar' => 'bar'), true, $this);
 
         $instance->setBar($this->get('bar'));
         $instance->initialize();
@@ -169,9 +169,9 @@ protected function getFooService()
      */
     protected function getFoo_BazService()
     {
-        $this->services['foo.baz'] = $instance = BazClass::getInstance();
+        $this->services['foo.baz'] = $instance = \BazClass::getInstance();
 
-        BazClass::configureStatic1($instance);
+        \BazClass::configureStatic1($instance);
 
         return $instance;
     }