diff --git a/package.json b/package.json
index 972ba9a10..2c2bdfe31 100644
--- a/package.json
+++ b/package.json
@@ -53,7 +53,6 @@
 		"vbb-translate-ids": "^3.1.0"
 	},
 	"devDependencies": {
-		"ajv": "^6.10.0",
 		"db-stations": "^2.3.0",
 		"is-coordinates": "^2.0.2",
 		"is-roughly-equal": "^0.1.0",
@@ -65,7 +64,6 @@
 	},
 	"scripts": {
 		"test": "env NODE_ENV=dev node test/index.js",
-		"find-unknown-fields": "node find-unknown-fields/index.js",
 		"prepublishOnly": "npm test | tap-spec",
 		"install": "node lib/generate-install-id.js >id.json"
 	}
diff --git a/find-unknown-fields/departures.schema.json b/tools/find-unknown-fields/departures.schema.json
similarity index 100%
rename from find-unknown-fields/departures.schema.json
rename to tools/find-unknown-fields/departures.schema.json
diff --git a/find-unknown-fields/index.js b/tools/find-unknown-fields/index.js
similarity index 92%
rename from find-unknown-fields/index.js
rename to tools/find-unknown-fields/index.js
index 4e0f78bae..678bf0715 100644
--- a/find-unknown-fields/index.js
+++ b/tools/find-unknown-fields/index.js
@@ -2,10 +2,10 @@
 
 const Ajv = require('ajv')
 const omit = require('lodash/omit')
-const createClient = require('..')
-const vbbProfile = require('../p/vbb')
-const bvgProfile = require('../p/bvg')
-const dbProfile = require('../p/db')
+const createClient = require('../..')
+const vbbProfile = require('../../p/vbb')
+const bvgProfile = require('../../p/bvg')
+const dbProfile = require('../../p/db')
 const journeysSchema = require('./journeys.schema.json')
 const departuresSchema = require('./departures.schema.json')
 // todo: https://github.com/epoberezkin/ajv#formats
diff --git a/find-unknown-fields/journeys.schema.json b/tools/find-unknown-fields/journeys.schema.json
similarity index 100%
rename from find-unknown-fields/journeys.schema.json
rename to tools/find-unknown-fields/journeys.schema.json
diff --git a/tools/find-unknown-fields/package.json b/tools/find-unknown-fields/package.json
new file mode 100644
index 000000000..a35c773ea
--- /dev/null
+++ b/tools/find-unknown-fields/package.json
@@ -0,0 +1,9 @@
+{
+	"private": true,
+	"name": "find-unknown-fields",
+	"version": "1.0.0",
+	"main": "index.js",
+	"dependencies": {
+		"ajv": "^6.10.1"
+	}
+}