diff --git a/src/Symfony/Component/Filesystem/Filesystem.php b/src/Symfony/Component/Filesystem/Filesystem.php
index 16d83dc2e5..3a5e332b9e 100644
--- a/src/Symfony/Component/Filesystem/Filesystem.php
+++ b/src/Symfony/Component/Filesystem/Filesystem.php
@@ -516,8 +516,8 @@ class Filesystem
             }
 
             $this->chmod($tmpFile, $mode);
-        } else {
-            @chmod($tmpFile, file_exists($filename) ? fileperms($filename) : 0666 & ~umask());
+        } elseif (file_exists($filename)) {
+            @chmod($tmpFile, fileperms($filename));
         }
 
         $this->rename($tmpFile, $filename, true);
diff --git a/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php b/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php
index 4f7457898b..f879e64170 100644
--- a/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php
+++ b/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php
@@ -1050,6 +1050,19 @@ class FilesystemTest extends FilesystemTestCase
         $this->assertSame('bar', file_get_contents($filename));
     }
 
+    public function testDumpKeepsExistingPermissionsWhenOverwritingAnExistingFile()
+    {
+        $this->markAsSkippedIfChmodIsMissing();
+
+        $filename = $this->workspace.DIRECTORY_SEPARATOR.'foo.txt';
+        file_put_contents($filename, 'FOO BAR');
+        chmod($filename, 0745);
+
+        $this->filesystem->dumpFile($filename, 'bar', null);
+
+        $this->assertFilePermissions(745, $filename);
+    }
+
     public function testCopyShouldKeepExecutionPermission()
     {
         $this->markAsSkippedIfChmodIsMissing();