diff --git a/src/Symfony/Component/DependencyInjection/composer.json b/src/Symfony/Component/DependencyInjection/composer.json
index 5de5c0bfda..41746e95e0 100644
--- a/src/Symfony/Component/DependencyInjection/composer.json
+++ b/src/Symfony/Component/DependencyInjection/composer.json
@@ -23,6 +23,9 @@
         "symfony/config": "~2.2",
         "symfony/expression-language": "~2.6"
     },
+    "conflict": {
+        "symfony/expression-language": "<2.6"
+    },
     "suggest": {
         "symfony/yaml": "",
         "symfony/config": "",