diff --git a/lib/datasource/docker/index.ts b/lib/datasource/docker/index.ts
index a0af28d1ed0b34be2444401660407b4f90cacc81..8a2c24c908e90b94c2a19a9ad4b02a41f23f4229 100644
--- a/lib/datasource/docker/index.ts
+++ b/lib/datasource/docker/index.ts
@@ -495,7 +495,7 @@ async function getLabels(
     // istanbul ignore if
     if (manifest.schemaVersion !== 2) {
       logger.debug(
-        { registry, dockerRepository: repository, tag, manifest },
+        { registry, dockerRepository: repository, tag },
         'Manifest schema version is not 2'
       );
       return {};