diff --git a/composer.json b/composer.json
index f4c1fec40..94e2c06c0 100644
--- a/composer.json
+++ b/composer.json
@@ -67,7 +67,7 @@
         "symfony/translation": "^3.3",
         "symfony/yaml": "^3.3",
         "tobscure/json-api": "^0.3.0",
-        "wikimedia/less.php": "^2.0"
+        "wikimedia/less.php": "^1.8"
     },
     "require-dev": {
         "mockery/mockery": "^1.0",