diff --git a/composer.json b/composer.json
index 307df90..fda5162 100644
--- a/composer.json
+++ b/composer.json
@@ -33,12 +33,12 @@
         }
     },
     "replace": {
-        "tinyimg": "self.version",
         "typo3-ter/tinyimg": "self.version"
     },
     "extra": {
         "typo3/cms": {
             "cms-package-dir": ".Build/typo3/cms",
+            "extension-key": "tinyimg",
             "web-dir": ".Build/Web",
             "Package": {
                 "partOfMinimalUsableSystem": true