diff --git a/tests/ConfigTest.php b/tests/ConfigTest.php
index 8ac6e51f7e5..6ba0a9c6abd 100644
--- a/tests/ConfigTest.php
+++ b/tests/ConfigTest.php
@@ -128,7 +128,9 @@ public function testThatFinderWorksWithDirSetOnConfig()
         );
 
         static::assertCount(3, $items);
-        usort($items, function (\SplFileInfo $a, \SplFileInfo $b) { return strcmp($a, $b); });
+        usort($items, function (\SplFileInfo $a, \SplFileInfo $b) {
+            return strcmp($a->getFilename(), $b->getFilename());
+        });
         static::assertSame('.php_cs', $items[0]->getFilename());
         static::assertSame('.php_cs.dist', $items[1]->getFilename());
         static::assertSame('somefile.php', $items[2]->getFilename());
@@ -147,7 +149,9 @@ public function testThatCustomFinderWorks()
         );
 
         static::assertCount(3, $items);
-        usort($items, function (\SplFileInfo $a, \SplFileInfo $b) { return strcmp($a, $b); });
+        usort($items, function (\SplFileInfo $a, \SplFileInfo $b) {
+            return strcmp($a->getFilename(), $b->getFilename());
+        });
         static::assertSame('.php_cs', $items[0]->getFilename());
         static::assertSame('.php_cs.dist', $items[1]->getFilename());
         static::assertSame('somefile.php', $items[2]->getFilename());
@@ -166,7 +170,9 @@ public function testThatCustomSymfonyFinderWorks()
         );
 
         static::assertCount(2, $items);
-        usort($items, function (\SplFileInfo $a, \SplFileInfo $b) { return strcmp($a, $b); });
+        usort($items, function (\SplFileInfo $a, \SplFileInfo $b) {
+            return strcmp($a->getFilename(), $b->getFilename());
+        });
         static::assertSame('somefile.php', $items[0]->getFilename());
         static::assertSame('somefile2.php.txt', $items[1]->getFilename());
     }