diff --git a/lib/datasource/npm.js b/lib/datasource/npm.js
index 5c2dad7aa88d029da3375a0054f81ad70c8c15eb..5f704675a54714bdc518faac055ef0332dc1fc58 100644
--- a/lib/datasource/npm.js
+++ b/lib/datasource/npm.js
@@ -191,7 +191,10 @@ async function getDependency(name, retries = 5) {
     }
     if (err.statusCode === 404 || err.code === 'ENOTFOUND') {
       logger.info({ name }, `Dependency lookup failure: not found`);
-      logger.debug({ err });
+      logger.debug({
+        err,
+        token: authInfo ? maskToken(authInfo.token) : 'none',
+      });
       return null;
     }
     if (err.name === 'ParseError') {