diff --git a/build/composer.json b/build/composer.json
index b0facd795..034c6631f 100644
--- a/build/composer.json
+++ b/build/composer.json
@@ -1,6 +1,6 @@
 {
     "minimum-stability": "dev",
     "require": {
-        "juliushaertl/phpdoc-to-rst": "dev-master"
+        "juliushaertl/phpdoc-to-rst": "dev-php7.0"
     }
 }