diff --git a/tests/Composer/Test/InstallerTest.php b/tests/Composer/Test/InstallerTest.php
index 69b292b7a..110980dec 100644
--- a/tests/Composer/Test/InstallerTest.php
+++ b/tests/Composer/Test/InstallerTest.php
@@ -226,6 +226,7 @@ class InstallerTest extends TestCase
 
         if ($expectLock) {
             unset($actualLock['hash']);
+            unset($actualLock['_readme']);
             $this->assertEquals($expectLock, $actualLock);
         }