diff --git a/lib/bin.js b/lib/bin.js
index 0069bb37..2ccedd37 100755
--- a/lib/bin.js
+++ b/lib/bin.js
@@ -78,12 +78,16 @@ const shouldJSON = (conf, result) =>
 const pretty = (conf, result) =>
   shouldJSON(conf, result) ? JSON.stringify(result, 0, 2) : result
 
+let addedLogListener = false
 const main = args => {
   const conf = parse(args)
   if (conf.help || conf.h)
     return console.log(usage())
 
-  process.on('log', console.error)
+  if (!addedLogListener) {
+    process.on('log', console.error)
+    addedLogListener = true
+  }
 
   try {
     return run(conf)