diff --git a/lib/request.js b/lib/request.js
index 96d5da5f..aaca1558 100644
--- a/lib/request.js
+++ b/lib/request.js
@@ -2,7 +2,7 @@
 
 const crypto = require('crypto')
 let captureStackTrace = () => {}
-if (process.env.NODE_ENV === 'dev') {
+if (process.env.NODE_DEBUG === 'hafas-client') {
 	captureStackTrace = require('capture-stack-trace')
 }
 const {stringify} = require('query-string')
diff --git a/package.json b/package.json
index 90938153..9c305030 100644
--- a/package.json
+++ b/package.json
@@ -57,7 +57,7 @@
 		"vbb-stations-autocomplete": "^3.1.0"
 	},
 	"scripts": {
-		"test": "env NODE_ENV=dev node test/index.js",
+		"test": "env NODE_ENV=dev NODE_DEBUG=hafas-client node test/index.js",
 		"prepublishOnly": "npm test | tap-spec"
 	}
 }