diff --git a/src/Symfony/Component/Config/Resource/FileResource.php b/src/Symfony/Component/Config/Resource/FileResource.php
index b828e7d37f..4c00ae4140 100644
--- a/src/Symfony/Component/Config/Resource/FileResource.php
+++ b/src/Symfony/Component/Config/Resource/FileResource.php
@@ -60,7 +60,7 @@ class FileResource implements ResourceInterface, \Serializable
             return false;
         }
 
-        return filemtime($this->resource) < $timestamp;
+        return filemtime($this->resource) <= $timestamp;
     }
 
     public function serialize()
diff --git a/src/Symfony/Component/Config/Tests/ConfigCacheTest.php b/src/Symfony/Component/Config/Tests/ConfigCacheTest.php
index 27434f13c9..8508763185 100644
--- a/src/Symfony/Component/Config/Tests/ConfigCacheTest.php
+++ b/src/Symfony/Component/Config/Tests/ConfigCacheTest.php
@@ -128,7 +128,7 @@ class ConfigCacheTest extends \PHPUnit_Framework_TestCase
 
     private function makeCacheStale()
     {
-        touch($this->cacheFile, time() - 3600);
+        touch($this->cacheFile, filemtime($this->resourceFile) - 3600);
     }
 
     private function generateMetaFile()
diff --git a/src/Symfony/Component/Config/Tests/Resource/FileResourceTest.php b/src/Symfony/Component/Config/Tests/Resource/FileResourceTest.php
index 1f1ddee23f..d152806d0c 100644
--- a/src/Symfony/Component/Config/Tests/Resource/FileResourceTest.php
+++ b/src/Symfony/Component/Config/Tests/Resource/FileResourceTest.php
@@ -17,11 +17,13 @@ class FileResourceTest extends \PHPUnit_Framework_TestCase
 {
     protected $resource;
     protected $file;
+    protected $time;
 
     protected function setUp()
     {
         $this->file = realpath(sys_get_temp_dir()).'/tmp.xml';
-        touch($this->file);
+        $this->time = time();
+        touch($this->file, $this->time);
         $this->resource = new FileResource($this->file);
     }
 
@@ -42,11 +44,12 @@ class FileResourceTest extends \PHPUnit_Framework_TestCase
 
     public function testIsFresh()
     {
-        $this->assertTrue($this->resource->isFresh(time() + 10), '->isFresh() returns true if the resource has not changed');
-        $this->assertFalse($this->resource->isFresh(time() - 86400), '->isFresh() returns false if the resource has been updated');
+        $this->assertTrue($this->resource->isFresh($this->time), '->isFresh() returns true if the resource has not changed in same second');
+        $this->assertTrue($this->resource->isFresh($this->time + 10), '->isFresh() returns true if the resource has not changed');
+        $this->assertFalse($this->resource->isFresh($this->time - 86400), '->isFresh() returns false if the resource has been updated');
 
         $resource = new FileResource('/____foo/foobar'.rand(1, 999999));
-        $this->assertFalse($resource->isFresh(time()), '->isFresh() returns false if the resource does not exist');
+        $this->assertFalse($resource->isFresh($this->time), '->isFresh() returns false if the resource does not exist');
     }
 
     public function testSerializeUnserialize()