diff --git a/composer.json b/composer.json
index 485f475..ddbbae2 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
         }
     ],
     "require": {
-        "php": "4.x - 5.x"
+        "php": "4.x,5.x"
     },
     "autoload": {
         "files": ["bibtexbrowser.php"]