diff --git a/composer.json b/composer.json
index 17287142..51a5bf93 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
     "name": "matomo/referrer-spam-blacklist",
     "description": "Community-contributed list of referrer spammers",
-    "license": "CC0",
+    "license": "CC0-1.0",
     "replace": {
         "piwik/referrer-spam-blacklist":"*"
     }