diff --git a/res/composer-schema.json b/res/composer-schema.json
index 51687bbb5..2508791a0 100644
--- a/res/composer-schema.json
+++ b/res/composer-schema.json
@@ -222,7 +222,8 @@
                 },
                 "source": {
                     "type": "string",
-                    "description": "URL to the sources"
+                    "description": "URL to the sources",
+                    "format": "uri"
                 }
             }
         }
diff --git a/src/Composer/Package/Dumper/ArrayDumper.php b/src/Composer/Package/Dumper/ArrayDumper.php
index 4ee414985..d107f7aca 100644
--- a/src/Composer/Package/Dumper/ArrayDumper.php
+++ b/src/Composer/Package/Dumper/ArrayDumper.php
@@ -36,7 +36,7 @@ class ArrayDumper
             'keywords',
             'autoload',
             'repositories',
-            'support'
+            'support',
         );
 
         $data = array();