diff --git a/grumphp.yml b/grumphp.yml
index 077df18..eefbeca 100644
--- a/grumphp.yml
+++ b/grumphp.yml
@@ -5,3 +5,5 @@ parameters:
         phplint: ~
         phpunit:
             config_file: phpunit/phpunit.xml
+        jsonlint:
+            detect_key_conflicts: true