diff --git a/src/Symfony/Component/Mime/Tests/AbstractMimeTypeGuesserTest.php b/src/Symfony/Component/Mime/Tests/AbstractMimeTypeGuesserTest.php
index 6b5de034b3..7d5656054a 100644
--- a/src/Symfony/Component/Mime/Tests/AbstractMimeTypeGuesserTest.php
+++ b/src/Symfony/Component/Mime/Tests/AbstractMimeTypeGuesserTest.php
@@ -81,6 +81,10 @@ abstract class AbstractMimeTypeGuesserTest extends TestCase
 
     public function testGuessWithDuplicatedFileType()
     {
+        if (!$this->getGuesser()->isGuesserSupported()) {
+            $this->markTestSkipped('Guesser is not supported');
+        }
+
         $this->assertEquals('application/vnd.openxmlformats-officedocument.wordprocessingml.document', $this->getGuesser()->guessMimeType(__DIR__.'/Fixtures/test.docx'));
     }