diff --git a/src/janitor.js b/src/janitor.js
index 9849f415a..c964c4701 100644
--- a/src/janitor.js
+++ b/src/janitor.js
@@ -28,7 +28,7 @@ async function cleanupTmpVolume(containerInfo) {
 
     const cmd = 'find /tmp -type f -mtime +10 -exec rm -rf {} +'.split(' '); // 10 day old files
 
-    debug('cleanupTmpVolume %j', containerInfo.Names);
+    debug(`cleanupTmpVolume ${JSON.stringify(containerInfo.Names)}`);
 
     const [error, execContainer] = await safe(gConnection.getContainer(containerInfo.Id).exec({ Cmd: cmd, AttachStdout: true, AttachStderr: true, Tty: false }));
     if (error) throw new BoxError(BoxError.DOCKER_ERROR, `Failed to exec container: ${error.message}`);
@@ -53,4 +53,6 @@ async function cleanupDockerVolumes() {
     for (const container of containers) {
         await safe(cleanupTmpVolume(container), { debug }); // intentionally ignore error
     }
+
+    debug('Cleaned up docker volumes');
 }