diff --git a/renovate.json b/renovate.json
index 585696d..aefc176 100644
--- a/renovate.json
+++ b/renovate.json
@@ -4,7 +4,9 @@
     {
       "customType": "regex",
       "description": "Detect s6-overlay release version in Dockerfile curl download",
-      "fileMatch": ["^Dockerfile$"],
+      "managerFilePatterns": [
+        "/^Dockerfile$/"
+      ],
       "matchStrings": [
         "s6-overlay/releases/download/v(?<currentValue>[0-9.]+)/s6-overlay"
       ],