diff --git a/package.json b/package.json
index e0229b4f..3f9660f8 100644
--- a/package.json
+++ b/package.json
@@ -111,7 +111,7 @@
     "semantic-release": "semantic-release",
     "test": "npm run test:cli && npm run test:functional",
     "test:cli": "mocha tests/cliAccessibility.js --reporter spec --timeout 15000",
-    "test:functional": "mocha tests/*.spec.js --reporter spec --timeout 15000",
+    "test:functional": "UNEXPECTED_FULL_TRACE=true mocha tests/*.spec.js --reporter spec --timeout 15000",
     "app:build": "cd template && node ../bin/elm-app-cli.js build",
     "app:start": "cd template && node ../bin/elm-app-cli.js start",
     "app:test": "cd template && node ../bin/elm-app-cli.js test"