diff --git a/.gitignore b/.gitignore
index 8a3d477..b6e48c0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /composer.lock
 /vendor
-/.php_cs.cache
\ No newline at end of file
+/.php_cs.cache
+/build
\ No newline at end of file
diff --git a/test/DriverTest.php b/test/DriverTest.php
index fb77486..9a9fb01 100644
--- a/test/DriverTest.php
+++ b/test/DriverTest.php
@@ -233,9 +233,9 @@ abstract class DriverTest extends TestCase {
             // test for 0, because previous array_filter made that not work
             $dir = "{$fixtureDir}/newdir/with/recursive/creation/0/1/2";
 
-            yield File\mkdir($dir, 0764, true); // the umask is 022 by default
+            yield File\mkdir($dir, 0764, true);
             $stat = yield File\stat($dir);
-            $this->assertSame(0764, $stat["mode"] & 0777);
+            $this->assertSame(0764 & (~\umask()), $stat["mode"] & 0777);
         });
     }