diff --git a/src/Config/Processor/InheritanceProcessor.php b/src/Config/Processor/InheritanceProcessor.php
index 3329e24e9..9e8625af5 100644
--- a/src/Config/Processor/InheritanceProcessor.php
+++ b/src/Config/Processor/InheritanceProcessor.php
@@ -85,7 +85,7 @@ private static function inheritsTypeConfig($child, array $parents, array $config
 
         // Restore initial order
         \uksort($parentTypes, function ($a, $b) use ($parents) {
-            return \array_search($a, $parents, true) > \array_search($b, $parents, true);
+            return \array_search($a, $parents, true) > \array_search($b, $parents, true) ? 1 : 0;
         });
 
         $mergedParentsConfig = self::mergeConfigs(...\array_column($parentTypes, 'config'));